Properties of the Number 20575

Twenty Thousand Five Hundred Seventy-Five

Basics

Value: 20574 → 20575 → 20576

Parity: odd

Prime: No

Previous Prime: 20563

Next Prime: 20593

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 5 ² × 823

Divisors: 1, 5, 25, 823, 4115, 20575

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000001011111

Octal: 50137

Duodecimal: BAA7

Hexadecimal: 505f

Square: 423330625

Square Root: 143.43988287781053

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

Coordination sequence for (2,3,8) tiling of hyperbolic plane. A265058

Coefficients of (q*(j(q)-1728))^1/12 where j(q) is the elliptic modular invariant. A289330

Numerator of partial sums of a certain series. A101631

Index sequence for limit-block extending A000002 (Kolakoski sequence) with first term as initial block. A246145

Number of unlabeled simple connected graphs with n nodes of degree at most 3 and each node a member of exactly one cycle. A380805

Number of (w,x,y,z) with all terms in {0,...,n} and (least gapsize)<=2. A212898

Starts of runs of 3 consecutive numbers that have an equal number of unitary and nonunitary prime divisors (A348097). A348099

a(n) = ∑_d∣n (n/d) * 3^n-d. A359203

Numerators of sum of rows of the inverse of the triangle of Euler polynomial coefficients P(0,x)=1, 2P(n,x)=(1+x)*[(1+x)^n-1+x^n-1]. A230011

Integer part of ∑_k>=0 ∑_j=0..k n^j*A107045(k,j)/A107046(k,j). A107055