Properties of the Number 20941

Twenty Thousand Nine Hundred Forty-One

Basics

Value: 20940 → 20941 → 20942

Parity: odd

Prime: No

Previous Prime: 20939

Next Prime: 20947

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 43 × 487

Divisors: 1, 43, 487, 20941

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000111001101

Octal: 50715

Duodecimal: 10151

Hexadecimal: 51cd

Square: 438525481

Square Root: 144.7100549374507

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 and every divisor (except 1) contains the digit 4. A62670

Number of integer partitions of n such that the dual of the multiset partition obtained by factoring each part into prime numbers is a weak antichain. A326978

MM-numbers of crossing set partitions. A324324

a(n) = (3+n)*(2 + 33·n + n²)/6. A101860

G.f. satisfies: A(x) = 1/(1 - x/(1 - x·A(x))⁴)². A349023

Numbers k such that R_k+2 + 2·10^k is prime, where R_k = 11...1 is the repunit (A002275) of length k. A256926

Main diagonal of Wythoff array: w(n,n)=[ n*τ ]F(n+1)+(n-1)F(n), where τ=(1+sqrt(5))/2, F(n) = Fibonacci numbers. A20941

Numbers k such that (10·7^k -1)/3 is prime. A57018