Properties of the Number 20389

Twenty Thousand Three Hundred Eighty-Nine

Basics

Value: 20388 → 20389 → 20390

Parity: odd

Prime: Yes

Previous Prime: 20369

Next Prime: 20393

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 20389

Divisors: 1, 20389

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111110100101

Octal: 47645

Duodecimal: B971

Hexadecimal: 4fa5

Square: 415711321

Square Root: 142.79005567615695

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

Primes of the form p(k)² + q(m)² with k > 0 and m > 0, where p(.) is the partition function (A000041), and q(.) is the strict partition function (A000009). A233346

Array t(n,k): row n consists of the positive integers m for which the least splitter of H(m) and H(m+1) is n, where H denotes harmonic number. A227631

Luhn primes: primes p such that p + (p reversed) is also a prime. A61783

Class 7- primes. A81426

Primes p such that A001175(p) = (p-1)/6. A308791

Primes p such that A001177(p) = (p-1)/6. A308799

a(1) = 2, a(n) = k·a(n-1) + 1, where a(n) is the smallest prime of the form k·a(n-1) + 1 and k > 1. A59411

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

Sum of the sixth largest parts in the partitions of n into 7 parts. A308928

Primes p such that p+1, p+2 and p+3 have equal number of divisors. A119711