Properties of the Number 20855

Twenty Thousand Eight Hundred Fifty-Five

Basics

Value: 20854 → 20855 → 20856

Parity: odd

Prime: No

Previous Prime: 20849

Next Prime: 20857

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 5 × 43 × 97

Divisors: 1, 5, 43, 97, 215, 485, 4171, 20855

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000101110111

Octal: 50567

Duodecimal: 1009B

Hexadecimal: 5177

Square: 434931025

Square Root: 144.4126033281029

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

Numbers k such that k·8^k + 1 is prime. A242178

Number of terms in the fully expanded n-th derivative of x^{x^x}. A281434

Numbers which are palindromic in their Elias δ code representation. A281380

Number of irredundant sets in the n-gear graph. A290589

Integer part of (Product(n^{(1 + log(1 + i})/i²), {i, 1, n})). A62486

Nearest integer to (Product(n^{(1 + log(1 + i})/i²), {i, 1, n})). A62487

Numerator of Bernoulli(n, 2/7). A158507

Partial sums of 3-almost primes which are again 3-almost primes, i.e., have exactly 3 not necessarily distinct prime factors. A217018

a(n) = (n² + 1) * (2·n - 1). A290631

The number of unit squares enclosed by the rectangular spiral of which the n-th side has length prime(n). A356465