Number
820
820 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 3
- Digit sum
- 10
- Digital root
- 1
- Palindrome
- No
- Divisor count
- 12
- σ(n) — sum of divisors
- 1,764
Primality
Prime factorization: 2 2 × 5 × 41
Divisors & multiples
Aliquot sum (sum of proper divisors):
944
Representations
- In words
- eight hundred twenty
- Ordinal
- 820th
- Roman numeral
- DCCCXX
- Binary
- 1100110100
- Octal
- 1464
- Hexadecimal
- 334
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 820, here are decompositions:
- 11 + 809 = 820
- 23 + 797 = 820
- 47 + 773 = 820
- 59 + 761 = 820
- 101 + 719 = 820
- 137 + 683 = 820
- 167 + 653 = 820
- 173 + 647 = 820
Showing the first eight; more decompositions exist.
Unicode codepoint
̴
U+0334
Non-spacing mark (Mn)
UTF-8 encoding: CC B4 (2 bytes).
Hex color
#000334
RGB(0, 3, 52)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.52.