Properties of the Number 20291

Twenty Thousand Two Hundred Ninety-One

Basics

Value: 20290 → 20291 → 20292

Parity: odd

Prime: No

Previous Prime: 20287

Next Prime: 20297

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 103 × 197

Divisors: 1, 103, 197, 20291

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 100111101000011

Octal: 47503

Duodecimal: B8AB

Hexadecimal: 4f43

Square: 411724681

Square Root: 142.44648117801998

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

Number T(n,k) of isoscent sequences of length n with exactly k ascents; triangle T(n,k), n>=0, 0<=k<=n+3-ceiling(2·sqrt(n+2)), read by rows. A242351

Numbers that are the sum of eight fourth powers in exactly eight ways. A345840

Consider the spiral of Theodorus (A072895). This sequence gives the number of k successive triangles which is closer to 360 degrees than any previous k triangles. A224269

Main diagonal of table A083044. A83045

Number of isoscent sequences of length n with exactly two ascents. A243228

Number of compositions of n such that every subsequence has a different sum. A335357

Expansion of (2 + x + x²)/((1 - x)*(1 - x - x²)). A26390

floor[2ⁿ/Fibonacci(n)]. A57861

Numbers n for which there are exactly ten k such that n = k + reverse(k). A72434

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 395", based on the 5-celled von Neumann neighborhood. A271687