number.wiki
Number

30

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

Abundant Number Harshad / Niven Pronic / Oblong Sphenic Number Square Pyramidal Squarefree Year

Properties

Parity
Even
Digit count
2
Digit sum
3
Digital root
3
Palindrome
No
Divisor count
8
σ(n) — sum of divisors
72

Primality

Prime factorization: 2 × 3 × 5

Divisors & multiples

All divisors (8)
1 · 2 · 3 · 5 · 6 · 10 · 15 · 30
Aliquot sum (sum of proper divisors): 42
Factor pairs (a × b = 30)
1 × 30
2 × 15
3 × 10
5 × 6
First multiples
30 · 60 · 90 · 120 · 150 · 180 · 210 · 240 · 270 · 300

Representations

In words
thirty
Ordinal
30th
Roman numeral
XXX
Binary
11110
Octal
36
Hexadecimal
1E

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 30, here are decompositions:

  • 7 + 23 = 30
  • 11 + 19 = 30
  • 13 + 17 = 30
ASCII character

As an ASCII codepoint, 30 is control character (0x1E). ASCII control character.

Hex color
#00001E
RGB(0, 0, 30)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.30.