Properties of the Number 20557

Twenty Thousand Five Hundred Fifty-Seven

Basics

Value: 20556 → 20557 → 20558

Parity: odd

Prime: No

Previous Prime: 20551

Next Prime: 20563

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 61 × 337

Divisors: 1, 61, 337, 20557

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000001001101

Octal: 50115

Duodecimal: BA91

Hexadecimal: 504d

Square: 422590249

Square Root: 143.37712509323097

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 ordered triples (i,j,k) with |i|, |j|, |k|, |i·j*k| <= n. A226359

Ulam's spiral (ENE spoke). A143856

Number of binary strings of length n with no substrings equal to 0001 0110 or 1000. A164477

Strong pseudoprimes to base 72. A20298

Numbers k such that the continued fraction for sqrt(k) has period 83. A20422

Number of partitions of n satisfying (cn(0,5) = 0 and cn(1,5) = cn(4,5)). A36818

Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 23. A51988

Squarefree semiprimes k such that k+1 is the product of three distinct primes and k+2 is the product of four distinct primes. A376352

Largest eigenvalue, rounded to the nearest integer, of a rank n matrix of 1..n² filled successively along antidiagonals (A069480). A72332

Composite numbers coprime to 6 such that A179382(n) = A000265(n-1), the odd part of n-1. A225913