Properties of the Number 20731

Twenty Thousand Seven Hundred Thirty-One

Basics

Value: 20730 → 20731 → 20732

Parity: odd

Prime: Yes

Previous Prime: 20719

Next Prime: 20743

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 20731

Divisors: 1, 20731

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 101000011111011

Octal: 50373

Duodecimal: BBB7

Hexadecimal: 50fb

Square: 429774361

Square Root: 143.98263784220651

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

Prime time primes on 6-digit clocks, second definition: primes of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60. A295013

Primes of form k² - 5. A28877

Number of compositions (ordered partitions) of n into distinct prime powers (1 excluded). A331847

Primes p == 3 (mod 4) such that the multiplicative order of 2+-i modulo p in Gaussian integers (A385165) is not divisible by 2 or 3. A385188

Primes p such that p-12, p and p+12 are consecutive primes. A53072

Primes p such that reversal(p) - 13 is a square. A176371

Primes in which the unit place digit is 1 and the k-th most significant digit is prime (2,3,5,7) if k is prime else is composite (4,6,8,9,0). A89704

Primes p of the form : p+p²+p³-+4=prime. A154822

Number of partitions p of n such that m(p) <= m(c(p)), where m = minimal multiplicity of parts, and c = conjugate. A240730

Prime(r) for r such that prime(r) - prime(r-1) = 12 and prime(r-1) - prime(r-2) = 2. A299110