Properties of the Number 20900

Twenty Thousand Nine Hundred

Basics

Value: 20899 → 20900 → 20901

Parity: even

Prime: No

Previous Prime: 20899

Next Prime: 20903

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 5 ² × 11 × 19

Divisors: 1, 2, 4, 5, 10, 11, 19, 20, 22, 25

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101000110100100

Octal: 50644

Duodecimal: 10118

Hexadecimal: 51a4

Square: 436810000

Square Root: 144.5683229480096

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

Composite numbers divisible by the palindromic sum of their prime factors (counted with multiplicity). A46358

a(n) = 4·n*(n² + 2)/3. A217873

Consider sequence of fractions A066657/A066658 produced by ratios of terms in A066720; let m = smallest integer such that all fractions 1/n, 2/n, ..., (n-1)/n have appeared when we reach A066720(m) = k; sequence gives values of m; set a(n) = -1 if some fraction i/n never appears. A66849

Twice 13-gonal numbers: a(n) = n*(11·n - 9). A152997

Numbers with digit sum 11 that are multiples of 11. A283742

Nonnegative integers k such that the Euclidean distance between the vector of proportions of the digits 0-9 in 2^k and the uniform distribution (1/10, ..., 1/10) sets a new minimum. A393331

Nonnegative integers k such that the Manhattan distance between the vector of proportions of the digits 0-9 in 2^k and the uniform distribution (1/10, ..., 1/10) sets a new minimum. A393332

Nonnegative integers k such that the Chebyshev distance between the vector of proportions of the digits 0-9 in 2^k and the uniform distribution (1/10, ..., 1/10) sets a new minimum. A393333

Magic sums of 4 X 4 magic squares composed of odd squares. A271582

Averages of four consecutive cubes. A173965