Properties of the Number 20699

Twenty Thousand Six Hundred Ninety-Nine

Basics

Value: 20698 → 20699 → 20700

Parity: odd

Prime: No

Previous Prime: 20693

Next Prime: 20707

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 7 × 2957

Divisors: 1, 7, 2957, 20699

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000011011011

Octal: 50333

Duodecimal: BB8B

Hexadecimal: 50db

Square: 428448601

Square Root: 143.87147041717478

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

Floor(ζ(3)ⁿ). A125890

Hypercomma numbers: n occurs in the sequence S[k+1]=S[k]+10·last_digit(S[k-1])+first_digit(S[k]) for each "legal" splitting n=concat(S[0],S[1]). A166508

3-comma numbers: n occurs in the sequence S[k+1]=S[k]+10·last_digit(S[k-1])+first_digit(S[k]) for three different splittings n=concat(S[0],S[1]). A166513

Number of maximal matchings in the n-Moebius ladder. A284710

Number of subsets of {1,...,n} containing {a,a+2,a+4} for some a. A209409

Denominators of continued fraction convergents to sqrt(295). A41555

a(n) = 900·n - 1. A158409

Number of partitions of n with equal number of parts congruent to each of 0 and 1 (mod 5). A35552

Numerator of the sum of the reciprocals of all square divisors of all positive integers <= n. A384817

Odd composite numbers such that the sum of any two terms, plus 1, is composite. A133763