Properties of the Number 20804

Twenty Thousand Eight Hundred Four

Basics

Value: 20803 → 20804 → 20805

Parity: even

Prime: No

Previous Prime: 20789

Next Prime: 20807

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 7 × 743

Divisors: 1, 2, 4, 7, 14, 28, 743, 1486, 2972, 5201

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000101000100

Octal: 50504

Duodecimal: 10058

Hexadecimal: 5144

Square: 432806416

Square Root: 144.23591785682234

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

Non-balanced numbers in A015771. A78549

Numbers k such that ∑_j=1..k-1 j·2^j-1 is prime. A119529

Number of (w,x,y) with all terms in {0,...,n} and |w-x| ≠ |x-y|. A212960

Molien series for group H_1,3⁸ of order 2304. A51531

Numbers k such that (k / sum of digits of k) and (k+1 / sum of digits of k+1) are both semiprime. A85774

Number of integer partitions of n whose product is a powerful number. A330106

Array read by diagonals downwards: A(n,k) for n>=2 and k>=0 is the number of (n,k)-polyominoes counting as distinct different formations of transparent squares. A381057

Decimal expansion of 1/sqrt(47). A20804

Number of compositions of n where each part i is marked with a word of length i over a septenary alphabet whose letters appear in alphabetical order and all seven letters occur at least once in the composition. A293584