Properties of the Number 20629

Twenty Thousand Six Hundred Twenty-Nine

Basics

Value: 20628 → 20629 → 20630

Parity: odd

Prime: No

Previous Prime: 20627

Next Prime: 20639

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 7 ² × 421

Divisors: 1, 7, 49, 421, 2947, 20629

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000010010101

Octal: 50225

Duodecimal: BB31

Hexadecimal: 5095

Square: 425555641

Square Root: 143.62799170078233

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

Ulam's spiral (NNE spoke). A143861

Numbers k in A228058 such that also A001065(k) is in A228058. A325380

<h[d,d],s[d,d]*s[d,d]*s[d,d]> where h[d,d] is a homogeneous symmetric function, s[d,d] is a Schur function indexed by two parts, * represents the Kronecker product and <, > is the standard scalar product on symmetric functions. A115375

Expansion of x³ / (1 - x - 5·x² - x³ + x⁴). A129113

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 705", based on the 5-celled von Neumann neighborhood. A273419

a(n) = ∑_{i,j = 0..n} C(n, i)²*C(n, j)²*C(i+j, i)*2^i+j. A383274

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

Smallest nonempty set S containing prime divisors of 9k+7 for each k in S. A20629