Number

620

620 is a composite number, even, a calendar year.

620 (six hundred twenty) is an even 3-digit number. It is a composite number with 12 divisors, and factors as 2² × 5 × 31. Its proper divisors sum to 724, more than the number itself, making it an abundant number. Written other ways, in Roman numerals it is DCXX and in binary, 1001101100.

Abundant Number Arithmetic Number Cube-Free Descending Digits Odious Number Pernicious Number Practical Number Preferred Number Recamán's Sequence Semiperfect Number Year

Interestingness

★ ★ ★ ★ ☆

7 notable facts · grade B

608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632

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Historical context — 620 AD

Calendar year

Year 620 (DCXX) was a leap year starting on Tuesday of the Julian calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 Read the full article on Wikipedia →

Historical context — 620 BC

Calendar year

The year 620 BC was a year of the pre-Julian Roman calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 Read the full article on Wikipedia →

Year facts

Year type: Leap year
Divisible by 4 and not by 100; February has 29 days.
Days in year: 366
ISO weeks: 52
Started on: Saturday
January 1, 620
Ended on: Sunday
December 31, 620
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 620s
620–629
Century: 7th century
601–700
Millennium: 1st millennium
1–1000
Years ago: 1,406
1406 years before 2026.

In other calendars

Hebrew: 4380 / 4381 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Metal zodiac:Dragon
Sexagenary cycle position 17 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1163 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 612 / 613 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 542 / 541 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 8
Digit product: 0
Digital root: 8
Palindrome: No
Bit width: 10 bits
Reversed: 26
Recamán's sequence: a(8,900) = 620
Square (n²): 384,400
Cube (n³): 238,328,000
Divisor count: 12
σ(n) — sum of divisors: 1,344
φ(n) — Euler's totient: 240
Sum of prime factors: 40

Primality

Prime factorization: 2 ² × 5 × 31

Nearest primes: 619 (−1) · 631 (+11)

Divisors & multiples

All divisors (12)

1 · 2 · 4 · 5 · 10 · 20 · 31 · 62 · 124 · 155 · 310 (half) · 620

Aliquot sum (sum of proper divisors): 724

Factor pairs (a × b = 620)

1 × 620

2 × 310

4 × 155

5 × 124

10 × 62

20 × 31

First multiples

620 · 1,240 (double) · 1,860 · 2,480 · 3,100 · 3,720 · 4,340 · 4,960 · 5,580 · 6,200

Sums & aliquot sequence

As consecutive integers: 122 + 123 + 124 + 125 + 126 74 + 75 + … + 81 5 + 6 + … + 35

Aliquot sequence: 620 → 724 → 550 → 566 → 286 → 218 → 112 → 136 → 134 → 70 → 74 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Continued fraction of √n

√620 = [24; (1, 8, 1, 48)]

Period length 4 — the block in parentheses repeats forever.

Representations

In words: six hundred twenty
Ordinal: 620th
Roman numeral: DCXX
Binary: 1001101100
Octal: 1154
Hexadecimal: 0x26C
Base64: Amw=
One's complement: 64,915 (16-bit)
Scientific notation: 6.2 × 10²
As a duration: 620 s = 10 minutes, 20 seconds

In other bases

ternary (3) 211222

quaternary (4) 21230

quinary (5) 4440

senary (6) 2512

septenary (7) 1544

nonary (9) 758

undecimal (11) 514

duodecimal (12) 438

tridecimal (13) 389

tetradecimal (14) 324

pentadecimal (15) 2b5

As an angle

620° = 1 × 360° + 260°

260° ≈ 4.538 rad

Compass bearing: W (west)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒌋 𒌋𒌋
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆
Greek (Milesian): χκʹ
Mayan (base 20): 𝋡·𝋫·𝋠
Chinese: 六百二十
Chinese (financial): 陸佰貳拾

In other modern scripts

Eastern Arabic ٦٢٠ Devanagari ६२० Bengali ৬২০ Tamil ௬௨௦ Thai ๖๒๐ Tibetan ༦༢༠ Khmer ៦២០ Lao ໖໒໐ Burmese ၆၂၀

Digit at this position in famous constants

π — Pi (π): Digit 620 = 8
e — Euler's number (e): Digit 620 = 3
φ — Golden ratio (φ): Digit 620 = 2
√2 — Pythagoras's (√2): Digit 620 = 2
ln 2 — Natural log of 2: Digit 620 = 6
γ — Euler-Mascheroni (γ): Digit 620 = 2

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 620, here are decompositions:

3 + 617 = 620
7 + 613 = 620
13 + 607 = 620
19 + 601 = 620
43 + 577 = 620
73 + 547 = 620
79 + 541 = 620
97 + 523 = 620

Showing the first eight; more decompositions exist.

Unicode codepoint

Latin Small Letter L With Belt

U+026C

Lowercase letter (Ll)

UTF-8 encoding: C9 AC (2 bytes).

Lookup U+026C on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00026C

RGB(0, 2, 108)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.108.

Address: 0.0.2.108
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.108

Unspecified address (0.0.0.0/8) — "this network" placeholder.

NANP area code 620

The number 620 is an active NANP area code (North American Numbering Plan).

Primary area: Western Kansas / Dodge City
Region: Kansas
Country: United States

Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.

Look up area code 620 ↗

Musical pitch

Heard as a frequency, 620 Hz is closest to:

Concert pitch (A4 = 440 Hz): D♯5 (622.3 Hz, -6¢)
Scientific pitch (C4 = 256 Hz): D♯5 (608.9 Hz, +31¢)
Baroque pitch (A4 = 415 Hz): E5 (621.8 Hz, -5¢)

Food additive (E-number)

On an ingredients label, E620 is Glutamic acid, a flavour enhancer.

E-number reference (Wikipedia) ↗