Properties of the Number -20493

Twenty Thousand Four Hundred Ninety-Three

Basics

Value: -20494 → -20493 → -20492

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ⁴ × 11 × 23

Divisors: 1, 3, 9, 11, 23, 27, 33, 69, 81, 99

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101000000001101

Octal: -50015

Duodecimal: -BA39

Hexadecimal: -500d

Square: 419963049

Square Root: 143.1537634852818

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) = n*(n+1)*(11·n+1)/6. A132112

Non-palindromic numbers n such that φ(n) = φ(reversal(n)). A97647

Number of nondividing sets on {1,2,...,n}. A51014

Number of inequivalent (ordered) solutions to n² = sum of 8 squares of integers >= 0. A65462

Smallest odd number k such that p(2m)-2p(m)=k has exactly n solutions (where p(m) = m-th prime). A69890

Nonsquarefree numbers k such that A276086(A003415(k)) <= k, where A003415 is the arithmetic derivative and A276086 is the primorial base exp-function. A392873

Number of (n+1)X(7+1) 0..1 arrays with every 2X2 subblock antidiagonal maximum minus diagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal minimum nondecreasing vertically. A253396

Numbers n such that n | 12ⁿ + 11ⁿ + 10ⁿ + 9ⁿ + 8ⁿ + 7ⁿ. A57257