Number
22
22 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 2
- Digit sum
- 4
- Digital root
- 4
- Palindrome
- Yes
- Divisor count
- 4
- σ(n) — sum of divisors
- 36
Primality
Prime factorization: 2 × 11
Divisors & multiples
Aliquot sum (sum of proper divisors):
14
Representations
- In words
- twenty-two
- Ordinal
- 22nd
- Roman numeral
- XXII
- Binary
- 10110
- Octal
- 26
- Hexadecimal
- 16
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 22, here are decompositions:
- 3 + 19 = 22
- 5 + 17 = 22
- 11 + 11 = 22
ASCII character
As an ASCII codepoint, 22 is control character (0x16). ASCII control character.
Network port
TCP/UDP port 22 is the well-known port for SSH — Secure Shell — encrypted remote login.
Hex color
#000016
RGB(0, 0, 22)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.22.