number.wiki
Number

520

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

Abundant Number Year

Properties

Parity
Even
Digit count
3
Digit sum
7
Digital root
7
Palindrome
No
Divisor count
16
σ(n) — sum of divisors
1,260

Primality

Prime factorization: 2 3 × 5 × 13

Divisors & multiples

All divisors (16)
1 · 2 · 4 · 5 · 8 · 10 · 13 · 20 · 26 · 40 · 52 · 65 · 104 · 130 · 260 · 520
Aliquot sum (sum of proper divisors): 740
Factor pairs (a × b = 520)
1 × 520
2 × 260
4 × 130
5 × 104
8 × 65
10 × 52
13 × 40
20 × 26
First multiples
520 · 1,040 · 1,560 · 2,080 · 2,600 · 3,120 · 3,640 · 4,160 · 4,680 · 5,200

Representations

In words
five hundred twenty
Ordinal
520th
Roman numeral
DXX
Binary
1000001000
Octal
1010
Hexadecimal
208

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 520, here are decompositions:

  • 11 + 509 = 520
  • 17 + 503 = 520
  • 29 + 491 = 520
  • 41 + 479 = 520
  • 53 + 467 = 520
  • 59 + 461 = 520
  • 71 + 449 = 520
  • 89 + 431 = 520

Showing the first eight; more decompositions exist.

Unicode codepoint
Ȉ
U+0208
Uppercase letter (Lu)

UTF-8 encoding: C8 88 (2 bytes).

Lookup U+0208 on Compart ↗ Lookup on FileFormat.Info ↗
Hex color
#000208
RGB(0, 2, 8)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.8.