Properties of the Number 20923

Twenty Thousand Nine Hundred Twenty-Three

Basics

Value: 20922 → 20923 → 20924

Parity: odd

Prime: No

Previous Prime: 20921

Next Prime: 20929

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 7 ³ × 61

Divisors: 1, 7, 49, 61, 343, 427, 2989, 20923

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000110111011

Octal: 50673

Duodecimal: 10137

Hexadecimal: 51bb

Square: 437771929

Square Root: 144.64784823840276

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

Gaps of 6 in sequence A038593 (upper terms). A38652

Numerators of Newton-Cotes formulas. A93735

Lengths of runs of the initial digits of semiprimes in decimal representation, cf. A239634. A239639

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 15 ones. A31783

Indices of primes in sequence defined by A(0) = 77, A(n) = 10·A(n-1) - 13 for n > 0. A56259

Positive numbers y such that y² is of the form x²+(x+16807)² with integer x. A156713

a(n) = floor((1 + 1/π)ⁿ). A179492

Number of 3X3X3 triangular 0..n arrays with no element lying outside the (possibly reversed) range delimited by its sw and se neighbors, and every horizontal row having the same average value. A214541

a(1) = 1; a(n) = a(n-1) + 2·a(floor(n/2)). A347027

Numbers whose base-12 representation has exactly 5 runs. A43654