Properties of the Number -20513

Twenty Thousand Five Hundred Thirteen

Basics

Value: -20514 → -20513 → -20512

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 73 × 281

Divisors: 1, 73, 281, 20513

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101000000100001

Octal: -50041

Duodecimal: -BA55

Hexadecimal: -5021

Square: 420783169

Square Root: 143.22360140703069

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

T(n,k)=Number of length n+6 0..k arrays with every seven consecutive terms having the maximum of some two terms equal to the minimum of the remaining five terms. A250154

Number of 8-almost primes 8ap such that 2ⁿ < 8ap <= 2ⁿ⁺¹. A120039

a(1) = 1; set of digits of a(n)² is a subset of the set of digits of a(n+1)². A66825

Expansion of x/((1-x-x³)*(1-x)⁵). A144899

Numbers n for which the numbers 6n+1, 3n+2, 6n+7 are all odd composite squarefree numbers, but none are semiprimes. A263510

Numbers k such that the largest prime factor of k is equal to the sum of primes dividing k+1 (with repetition). A71861

Composite hypotenuses of primitive Pythagorean triangles (A120961) that are not circumdiameters of non-Pythagorean primitive Heronian triangles (A285579). A329148

Coordination sequence for MgNi2, Position Mg1. A9936

Number of nondecreasing arrangements of 7 numbers x(i) in -(n+5)..(n+5) with the sum of sign(x(i))*2^|x(i)| zero. A187991

Number of length n+6 0..2 arrays with every seven consecutive terms having the maximum of some two terms equal to the minimum of the remaining five terms. A250148