Properties of the Number 20511

Twenty Thousand Five Hundred Eleven

Basics

Value: 20510 → 20511 → 20512

Parity: odd

Prime: No

Previous Prime: 20509

Next Prime: 20521

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 43 × 53

Divisors: 1, 3, 9, 43, 53, 129, 159, 387, 477, 2279

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101000000011111

Octal: 50037

Duodecimal: BA53

Hexadecimal: 501f

Square: 420701121

Square Root: 143.21661914736012

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

Numerators of increasingly better rational approximations to log(3)/log(2) with increasing denominators. A254351

Consider the 2^n-1 monic polynomials f(x) with coefficients 0 or 1, degree n and f(0)=1. Sequence gives triangle read by rows, in which T(n,k) (n>=1) is the number of such polynomials of thickness k (2 <= k <= n+1). A169940

Cyclotomic polynomials at x=-12. A20511

Number of (n+1)X3 0..2 arrays with the number of clockwise edge increases in 2X2 subblocks nondecreasing rightwards and downwards. A206506