Properties of the Number 20636

Twenty Thousand Six Hundred Thirty-Six

Basics

Value: 20635 → 20636 → 20637

Parity: even

Prime: No

Previous Prime: 20627

Next Prime: 20639

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 7 × 11 × 67

Divisors: 1, 2, 4, 7, 11, 14, 22, 28, 44, 67

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000010011100

Octal: 50234

Duodecimal: BB38

Hexadecimal: 509c

Square: 425844496

Square Root: 143.6523581428443

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

a(n) = ∑_k=0..n 2^n-k * binomial(n+4,k+4) * binomial(2·k+8,k+8). A387274

a(n+1) = 1 + a( floor(n/1) ) + a( floor(n/2) ) + ... + a( floor(n/n) ). A3318

a(n) = floor((π/2)ⁿ). A14214

Numbers of partitions of 2n into n primes. A102108

Number of permutations of 1..n with all differences of elements separated by distances 1 through 7 being respectively unique. A170813

Smallest nonempty set S containing prime divisors of 10k+8 for each k in S. A20636