number.wiki
Number

20,509

20,509 is a prime, odd.

Deficient Number Prime Squarefree Twin Prime

Properties

Parity
Odd
Digit count
5
Digit sum
16
Digital root
7
Palindrome
No
Divisor count
2
σ(n) — sum of divisors
20,510

Primality

20,509 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)
1 · 20509
Aliquot sum (sum of proper divisors): 1
Factor pairs (a × b = 20,509)
1 × 20509
First multiples
20,509 · 41,018 · 61,527 · 82,036 · 102,545 · 123,054 · 143,563 · 164,072 · 184,581 · 205,090

Representations

In words
twenty thousand five hundred nine
Ordinal
20509th
Binary
101000000011101
Octal
50035
Hexadecimal
501D

Also seen as

Prime neighborhood

Adjacent primes:

  • Previous prime: 20,507 (gap of 2)
  • Next prime: 20,521 (gap of 12)

Pair status: twin with 20507.

Unicode codepoint
U+501D
Other letter (Lo)

UTF-8 encoding: E5 80 9D (3 bytes).

Hex color
#00501D
RGB(0, 80, 29)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.80.29.