Properties of the Number 20959

Twenty Thousand Nine Hundred Fifty-Nine

Basics

Value: 20958 → 20959 → 20960

Parity: odd

Prime: Yes

Previous Prime: 20947

Next Prime: 20963

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 20959

Divisors: 1, 20959

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000111011111

Octal: 50737

Duodecimal: 10167

Hexadecimal: 51df

Square: 439279681

Square Root: 144.77223490711194

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

T(n,k)=Number of nXk 0..1 arrays with every element equal to 2, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero. A298629

The least number s having exactly n threes in the continued fraction of sqrt(s). A206583

Let F(g,p) be the frequency of g up to prime nextprime(p+1). Primes p such that F(2,p) = F(4,p) and g = 2 or 4. A274122

Number of (w,x,y,z) with all terms in {0,...,n} and at least one of them is the range of {w,x,y,z}. A212746

First differences of A145646. A145647

Primes p such that p·q*r + 6 and p·q*r - 6 are primes where q and r are the next two primes after p. A240715

Prime-indexed primes q such that prime(q)-q-1 is a prime indexed prime. A318751

Primes p such that the sum of the digits of p is not prime, but the sum of each digit raised to the 4th power is prime. A91368

Primes congruent to 36 mod 61. A142834

Number of nX5 0..1 arrays with every element equal to 2, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero. A298626