Properties of the Number 20948

Twenty Thousand Nine Hundred Forty-Eight

Basics

Value: 20947 → 20948 → 20949

Parity: even

Prime: No

Previous Prime: 20947

Next Prime: 20959

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 5237

Divisors: 1, 2, 4, 5237, 10474, 20948

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101000111010100

Octal: 50724

Duodecimal: 10158

Hexadecimal: 51d4

Square: 438818704

Square Root: 144.734239211045

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 of subsets of {1..n} whose harmonic mean is an integer. A339453

Indices of the start of 10 successive distinct digits in the decimal expansion of e (2.718281828...). A258166

Expansion of e.g.f.: log((-1+x)/(-1+2·x))². A52883

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 489", based on the 5-celled von Neumann neighborhood. A272512

Binomial coefficient binomial(n,4) = n*(n-1)*(n-2)*(n-3)/24. A332

Central Delannoy numbers: a(n) = ∑_k=0..n C(n,k)*C(n+k,k). A1850

a(n) = (2n+1)!/n!². A2457

Figurate numbers or binomial coefficients C(n,6). A579

a(n) = binomial coefficient C(n,8). A581

a(n) = n*(n+1)*(n+2)*(n+3)/4. A33487