Properties of the Number 20541

Twenty Thousand Five Hundred Forty-One

Basics

Value: 20540 → 20541 → 20542

Parity: odd

Prime: No

Previous Prime: 20533

Next Prime: 20543

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 41 × 167

Divisors: 1, 3, 41, 123, 167, 501, 6847, 20541

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000000111101

Octal: 50075

Duodecimal: BA79

Hexadecimal: 503d

Square: 421932681

Square Root: 143.32131732579072

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 distinct values of multinomial coefficients ( n / (p1, p2, p3, ...) ) where (p1, p2, p3, ...) runs over all partitions of n. A70289

a(n) = (n + 2)*(2·n² - n + 3)/6. A56520

Numbers k such that σ(k) = σ(k+4). A15863

27-gonal numbers: a(n) = n*(25·n-23)/2. A255186

T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 2, 3 or 4 king-move adjacent elements, with upper left element zero. A297915

Numbers of the form HMMSS with primes H < 24 and MM, SS < 60, for which the number of seconds after midnight, 3600·H+60·MM+SS, is also prime. A295011

T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero. A298328

T(n,k) = Number of n X k 0..1 arrays with every element equal to 0, 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero. A298508

T(n,k) = Number of n X k 0..1 arrays with every element equal to 0, 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero. A299221

Number of n X 2 0..1 arrays with every element equal to 0, 2, 3 or 4 king-move adjacent elements, with upper left element zero. A297909