Number
1,220
1,220 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 5
- Digital root
- 5
- Palindrome
- No
- Divisor count
- 12
- σ(n) — sum of divisors
- 2,604
Primality
Prime factorization: 2 2 × 5 × 61
Divisors & multiples
Aliquot sum (sum of proper divisors):
1,384
First multiples
Representations
- In words
- one thousand two hundred twenty
- Ordinal
- 1220th
- Roman numeral
- MCCXX
- Binary
- 10011000100
- Octal
- 2304
- Hexadecimal
- 4C4
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1220, here are decompositions:
- 3 + 1217 = 1220
- 7 + 1213 = 1220
- 19 + 1201 = 1220
- 67 + 1153 = 1220
- 97 + 1123 = 1220
- 103 + 1117 = 1220
- 127 + 1093 = 1220
- 151 + 1069 = 1220
Showing the first eight; more decompositions exist.
Unicode codepoint
ӄ
U+04C4
Lowercase letter (Ll)
UTF-8 encoding: D3 84 (2 bytes).
Hex color
#0004C4
RGB(0, 4, 196)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.196.