Number

220

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

Abundant Number Amicable Number Arithmetic Number Gapful Number Harshad / Niven Odious Number Pernicious Number Practical Number Recamán's Sequence Semiperfect Number Tetrahedral Year

Historical context — 220 AD

Calendar year

Year 220 (CCXX) was a leap year starting on Saturday of the Julian calendar.

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

Historical context — 220 BC

Calendar year

Year 220 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: 52
Started on: Saturday
January 1, 220
Ended on: Sunday
December 31, 220
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 220s
220–229
Century: 3rd century
201–300
Millennium: 1st millennium
1–1000
Years ago: 1,806
1806 years before 2026.

In other calendars

Hebrew: 3980 / 3981 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Metal zodiac:Rat
Sexagenary cycle position 37 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 763 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 212 / 213 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 142 / 141 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 4
Digit product: 0
Digital root: 4
Palindrome: No
Bit width: 8 bits
Reversed: 22
Recamán's sequence: a(2,592) = 220
Square (n²): 48,400
Cube (n³): 10,648,000
Divisor count: 12
σ(n) — sum of divisors: 504
φ(n) — Euler's totient: 80
Sum of prime factors: 20

Primality

Prime factorization: 2 ² × 5 × 11

Nearest primes: 211 (−9) · 223 (+3)

Divisors & multiples

All divisors (12)

1 · 2 · 4 · 5 · 10 · 11 · 20 · 22 · 44 · 55 · 110 (half) · 220

Aliquot sum (sum of proper divisors): 284

Factor pairs (a × b = 220)

1 × 220

2 × 110

4 × 55

5 × 44

10 × 22

11 × 20

First multiples

220 · 440 (double) · 660 · 880 · 1,100 · 1,320 · 1,540 · 1,760 · 1,980 · 2,200

Sums & aliquot sequence

As consecutive integers: 42 + 43 + 44 + 45 + 46 24 + 25 + … + 31 15 + 16 + … + 25

Aliquot sequence: 220 → 284 → 220 — enters a cycle

Representations

In words: two hundred twenty
Ordinal: 220th
Roman numeral: CCXX
Binary: 11011100
Octal: 334
Hexadecimal: 0xDC
Base64: 3A==
One's complement: 35 (8-bit)

In other bases

ternary (3) 22011

quaternary (4) 3130

quinary (5) 1340

senary (6) 1004

septenary (7) 433

nonary (9) 264

undecimal (11) 190

duodecimal (12) 164

tridecimal (13) 13c

tetradecimal (14) 11a

pentadecimal (15) ea

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹 𒌋𒌋𒌋𒌋
Egyptian hieroglyphic: 𓍢𓍢𓎆𓎆
Greek (Milesian): σκʹ
Mayan (base 20): 𝋫·𝋠
Chinese: 二百二十
Chinese (financial): 貳佰貳拾

In other modern scripts

Eastern Arabic ٢٢٠ Devanagari २२० Bengali ২২০ Tamil ௨௨௦ Thai ๒๒๐ Tibetan ༢༢༠ Khmer ២២០ Lao ໒໒໐ Burmese ၂၂၀

Digit at this position in famous constants

π — Pi (π): Digit 220 = 6
e — Euler's number (e): Digit 220 = 4
φ — Golden ratio (φ): Digit 220 = 1
√2 — Pythagoras's (√2): Digit 220 = 4
ln 2 — Natural log of 2: Digit 220 = 0
γ — Euler-Mascheroni (γ): Digit 220 = 0

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 220, here are decompositions:

23 + 197 = 220
29 + 191 = 220
41 + 179 = 220
47 + 173 = 220
53 + 167 = 220
71 + 149 = 220
83 + 137 = 220
89 + 131 = 220

Showing the first eight; more decompositions exist.

Unicode codepoint

Latin Capital Letter U With Diaeresis

U+00DC

Uppercase letter (Lu)

UTF-8 encoding: C3 9C (2 bytes).

Lookup U+00DC on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0000DC

RGB(0, 0, 220)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.220.

Address: 0.0.0.220
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.220

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

NANP area code 220

The number 220 is an active NANP area code (North American Numbering Plan).

Primary area: Newark / Lancaster
Region: Ohio
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 220 ↗

Possible US bank routing number

This passes the ABA routing number checksum and matches the Federal Reserve numbering scheme.

Routing number

000000220

Federal Reserve

United States Government

Banks operate many routing numbers per state and division; an unmatched checksum-valid number can still be a real RTN at a smaller institution.

Look up on FedACH (official) ↗ Search Google for routing number 000000220 ↗