Properties of the Number 20887

Twenty Thousand Eight Hundred Eighty-Seven

Basics

Value: 20886 → 20887 → 20888

Parity: odd

Prime: Yes

Previous Prime: 20879

Next Prime: 20897

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 20887

Divisors: 1, 20887

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000110010111

Octal: 50627

Duodecimal: 10107

Hexadecimal: 5197

Square: 436266769

Square Root: 144.52335451407154

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Numbers that are the sum of 5 positive 7th powers. A3372

Numbers k such that prime(k) + prime(k+1) + prime(k+2) is a square. A76305

Number of primes of the form x⁸ + 1 less than 10ⁿ. A214454

Primes congruent to 1 mod 59. A216315

Primes of the form 6·k² + 1. A90687

Primes p such that p+p²+p³-+2 are also prime. A154821

a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = 2·n - 2 - 2^p+1 and p is the unique integer such that 2^p < n - 1 <= 2^p+1, starting with a(1) = a(2) = 1 and a(3) = 3. A49895

Primes that remain prime through 3 iterations of function f(x) = 2x + 3. A23273

Primes p giving prime quadruples (30p+11, 30p+13, 30p+17, 30p+19). A87771

Numbers n such that 30·n+7, 30·n+11, 30·n+13, 30·n+17, 30·n+19 are consecutive primes. A89157