Properties of the Number 20658

Twenty Thousand Six Hundred Fifty-Eight

Basics

Value: 20657 → 20658 → 20659

Parity: even

Prime: No

Previous Prime: 20641

Next Prime: 20663

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 11 × 313

Divisors: 1, 2, 3, 6, 11, 22, 33, 66, 313, 626

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000010110010

Octal: 50262

Duodecimal: BB56

Hexadecimal: 50b2

Square: 426752964

Square Root: 143.7289114966088

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

Partial sums of A299291. A299292

Numbers k for which (7+k!)/7 is prime. A139065

Number of non-equivalent ways to place 2 non-attacking kings on an n X n board. A279111

Numbers that are the sum of four fourth powers in exactly two ways. A344193

Coefficients of the C-Dyson Mod 27 identity. A104503

Numbers k for which rank of the elliptic curve y²=x³+k·x is 4. A309031

Sum of the areas of triangles whose vertices lie on the n X n grid with unit spacing as enumerated in A045996. A61144

Numbers n > 13 such that xⁿ + x¹³ + x¹² + x¹¹ + x¹⁰ + x⁹ + x⁸ + x⁷ + x⁶ + x⁵ + x⁴ + x³ + x² + x + 1 is irreducible over GF(2). A57489

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 0), (0, -1, 1), (1, 0, 0), (1, 1, 0)}. A150334

Numbers k such that (424·10^k - 1)/9 is prime. A295626