Properties of the Number 20791

Twenty Thousand Seven Hundred Ninety-One

Basics

Value: 20790 → 20791 → 20792

Parity: odd

Prime: No

Previous Prime: 20789

Next Prime: 20807

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 17 × 1223

Divisors: 1, 17, 1223, 20791

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101000100110111

Octal: 50467

Duodecimal: 10047

Hexadecimal: 5137

Square: 432265681

Square Root: 144.19084575658746

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 (a, b, c) with gcd(a, b, c) = 1 and 1 <= {a, b, c} <= n. A71778

a(n) = n*(n² + 2·n - 1)/2. A127736

Number of growing self-avoiding walks of length n on a half-infinite strip of height 5 with a trapped endpoint. A374301

a(n) is the sum over all floor(k³/n), k=0 to n inclusive. A14818

Smallest number that is centered polygonal in exactly n ways. A63773

Numbers k such that 65·2^k+1 is prime. A32382

a(n) = the least integer that is centered polygonal in exactly n ways. A279830

Numbers n such that n³ contains the consecutive substring 2,3,5,7. A295900

Expansion of (1/x) * Series_Reversion( x / ((1+x)² - x⁴) ). A371427

Decimal expansion of 1/sqrt(34). A20791