Properties of the Number 20844

Twenty Thousand Eight Hundred Forty-Four

Basics

Value: 20843 → 20844 → 20845

Parity: even

Prime: No

Previous Prime: 20809

Next Prime: 20849

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ² × 3 ³ × 193

Divisors: 1, 2, 3, 4, 6, 9, 12, 18, 27, 36

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000101101100

Octal: 50554

Duodecimal: 10090

Hexadecimal: 516c

Square: 434472336

Square Root: 144.37451298619158

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

Decimal part of a(n)^1/2 starts with a 'nine digits' anagram. A34277

Number of base 6 n-digit numbers with adjacent digits differing by one or less. A126360

a(n) = a(n-1)+ceiling(a(n-2)/2) with a(0)=0, a(1)=1. A64323

a(n) = -3·a(n-1) + a(n-3), with a(0)=0, a(1)=-3, a(2)=12. A215919

Number of partitions of n such that m(greatest part) < m(1), where m = multiplicity. A240076

Number of distinct lines passing through at least three points in a triangular grid of side n. A234248

a(n) = a(n-1) + a(n-2) - floor(a(n-2)/2), starting 2,1. A173497

Expansion of (1-2x)²/((1-x)²(1-2x-x²)²). A108360

Number of 0..n arrays x(0..10) of 11 elements with zero 5th differences. A200373

Number of n X 3 0..2 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of elements above it or zero plus the sum of the elements diagonally to its northwest, modulo 3. A240034