Properties of the Number 20530

Twenty Thousand Five Hundred Thirty

Basics

Value: 20529 → 20530 → 20531

Parity: even

Prime: No

Previous Prime: 20521

Next Prime: 20533

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 2 × 5 × 2053

Divisors: 1, 2, 5, 10, 2053, 4106, 10265, 20530

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101000000110010

Octal: 50062

Duodecimal: BA6A

Hexadecimal: 5032

Square: 421480900

Square Root: 143.28293687665675

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

a(n) = ∑_i=0..n digsum₅(i)⁴, where digsum₅(i) = A053824(i). A231671

Numbers that contain as proper substrings every maximal prime power dividing them. A59401

Number of (n+3) X 5 binary arrays with every 4 X 4 subblock commuting with each horizontal and vertical neighbor 4 X 4 subblock. A188098

Least k such that k·30ⁿ-1 , k·30ⁿ+1, and 2·k*30ⁿ-1 are prime; that is, twin primes and a Sophie Germain prime. A212956

Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 31. A31619

Numbers that are divisible by 10 and are differences between two cubes in at least one way. A38854

a(n) = 8ⁿ + 2ⁿ⁺¹. A20530

Number of (n+1)X8 0..1 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards. A204038