Properties of the Number 20761

Twenty Thousand Seven Hundred Sixty-One

Basics

Value: 20760 → 20761 → 20762

Parity: odd

Prime: No

Previous Prime: 20759

Next Prime: 20771

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 13 × 1597

Divisors: 1, 13, 1597, 20761

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000100011001

Octal: 50431

Duodecimal: 10021

Hexadecimal: 5119

Square: 431019121

Square Root: 144.08677940741129

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

Numbers that are the sum of 6 positive 7th powers. A3373

G.f.: ∑_k>=1 x^k/(1-x^k) * ∏_k>=1 (1+x^k). A305082

The successive approximations up to 2ⁿ for 2-adic integer 9^1/3. A322999

Average of squares of successive primes: a(n) = (prime(n+1)² + prime(n)²)/2, with n >= 2. A75892

Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 566", based on the 5-celled von Neumann neighborhood. A283064

Consecutive states of the linear congruential pseudo-random number generator for the Texas Instruments TI99 when started at 1. A384221

a(n) = (3·11ⁿ - 7ⁿ)/2. A165151

Unsigned row sums of triangle A112707 (partial sums of Catalan numbers multiplied by powers of negative numbers). A112709

Fibonacci sequence beginning 0, 13. A22347

Diagonal sums of the Riordan matrix (1/(1-4x),(1-sqrt(1-4x))/(2·sqrt(1-4x))) (A188481). A188482