Number

320

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

Abundant Number Descending Digits Evil Number Happy Number Harshad / Niven Pernicious Number Practical Number Recamán's Sequence Semiperfect Number Year

Historical context — 320 AD

Calendar year

Year 320 (CCCXX) was a leap year starting on Friday of the Julian calendar.

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Historical context — 320 BC

Calendar year

Year 320 BC was a year of the pre-Julian Roman calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback 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: 53
Long year: contains 53 ISO weeks.
Started on: Thursday
January 1, 320
Ended on: Friday
December 31, 320
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 320s
320–329
Century: 4th century
301–400
Millennium: 1st millennium
1–1000
Years ago: 1,706
1706 years before 2026.

In other calendars

Hebrew: 4080 / 4081 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: 863 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 312 / 313 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 242 / 241 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 5
Digit product: 0
Digital root: 5
Palindrome: No
Bit width: 9 bits
Reversed: 23
Recamán's sequence: a(608) = 320
Square (n²): 102,400
Cube (n³): 32,768,000
Divisor count: 14
σ(n) — sum of divisors: 762
φ(n) — Euler's totient: 128
Sum of prime factors: 17

Primality

Prime factorization: 2 ⁶ × 5

Nearest primes: 317 (−3) · 331 (+11)

Divisors & multiples

All divisors (14)

1 · 2 · 4 · 5 · 8 · 10 · 16 · 20 · 32 · 40 · 64 · 80 · 160 (half) · 320

Aliquot sum (sum of proper divisors): 442

Factor pairs (a × b = 320)

1 × 320

2 × 160

4 × 80

5 × 64

8 × 40

10 × 32

16 × 20

First multiples

320 · 640 (double) · 960 · 1,280 · 1,600 · 1,920 · 2,240 · 2,560 · 2,880 · 3,200

Sums & aliquot sequence

As a sum of two squares: 8² + 16²

As consecutive integers: 62 + 63 + 64 + 65 + 66

Aliquot sequence: 320 → 442 → 314 → 160 → 218 → 112 → 136 → 134 → 70 → 74 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Representations

In words: three hundred twenty
Ordinal: 320th
Roman numeral: CCCXX
Binary: 101000000
Octal: 500
Hexadecimal: 0x140
Base64: AUA=
One's complement: 65,215 (16-bit)

In other bases

ternary (3) 102212

quaternary (4) 11000

quinary (5) 2240

senary (6) 1252

septenary (7) 635

nonary (9) 385

undecimal (11) 271

duodecimal (12) 228

tridecimal (13) 1b8

tetradecimal (14) 18c

pentadecimal (15) 165

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋
Egyptian hieroglyphic: 𓍢𓍢𓍢𓎆𓎆
Greek (Milesian): τκʹ
Mayan (base 20): 𝋰·𝋠
Chinese: 三百二十
Chinese (financial): 參佰貳拾

In other modern scripts

Eastern Arabic ٣٢٠ Devanagari ३२० Bengali ৩২০ Tamil ௩௨௦ Thai ๓๒๐ Tibetan ༣༢༠ Khmer ៣២០ Lao ໓໒໐ Burmese ၃၂၀

Digit at this position in famous constants

π — Pi (π): Digit 320 = 1
e — Euler's number (e): Digit 320 = 3
φ — Golden ratio (φ): Digit 320 = 3
√2 — Pythagoras's (√2): Digit 320 = 8
ln 2 — Natural log of 2: Digit 320 = 6
γ — Euler-Mascheroni (γ): Digit 320 = 2

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 320, here are decompositions:

3 + 317 = 320
7 + 313 = 320
13 + 307 = 320
37 + 283 = 320
43 + 277 = 320
79 + 241 = 320
97 + 223 = 320
109 + 211 = 320

Showing the first eight; more decompositions exist.

Unicode codepoint

Latin Small Letter L With Middle Dot

U+0140

Lowercase letter (Ll)

UTF-8 encoding: C5 80 (2 bytes).

Lookup U+0140 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000140

RGB(0, 1, 64)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.64.

Address: 0.0.1.64
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.1.64

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

NANP area code 320

The number 320 is an active NANP area code (North American Numbering Plan).

Primary area: St. Cloud
Region: Minnesota
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 320 ↗