number.wiki
Number

16

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

Deficient Number Perfect Square Power of Two Powerful Number Year

Properties

Parity
Even
Digit count
2
Digit sum
7
Digital root
7
Palindrome
No
Divisor count
5
σ(n) — sum of divisors
31

Primality

Prime factorization: 2 4

Divisors & multiples

All divisors (5)
1 · 2 · 4 · 8 · 16
Aliquot sum (sum of proper divisors): 15
Factor pairs (a × b = 16)
1 × 16
2 × 8
4 × 4
First multiples
16 · 32 · 48 · 64 · 80 · 96 · 112 · 128 · 144 · 160

Representations

In words
sixteen
Ordinal
16th
Roman numeral
XVI
Binary
10000
Octal
20
Hexadecimal
10

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 16, here are decompositions:

  • 3 + 13 = 16
  • 5 + 11 = 16
ASCII character

As an ASCII codepoint, 16 is control character (0x10). ASCII control character.

Hex color
#000010
RGB(0, 0, 16)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.16.