Properties of the Number 20839

Twenty Thousand Eight Hundred Thirty-Nine

Basics

Value: 20838 → 20839 → 20840

Parity: odd

Prime: No

Previous Prime: 20809

Next Prime: 20849

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 7 × 13 × 229

Divisors: 1, 7, 13, 91, 229, 1603, 2977, 20839

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000101100111

Octal: 50547

Duodecimal: 10087

Hexadecimal: 5167

Square: 434263921

Square Root: 144.35719587190658

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

Number of partitions of n into a prime number of parts. A38499

Relative of Hofstadter Q-sequence: a(n) = max(0, n+20830) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0. A283887

Number of parts in all partitions of n in which no part occurs more than 3 times. A117148

Lengths of bit runs in A123504. A123505

Structured pentagonal icositetrahedral numbers (vertex structure 10). A100168

Total number of palindromic primes in base 9 with n digits. A117788

Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= sqrt(n). A48095

Number of simple labeled graphs of order n that have 3k connected components for some k. A249672

Decimal expansion of 1/sqrt(82). A20839

Number of nX7 0..2 arrays with no element equal to any value at offset (-1,0) (0,-1) or (-2,-2) and new values introduced in order 0..2. A274857