Properties of the Number 20245

Twenty Thousand Two Hundred Forty-Five

Basics

Value: 20244 → 20245 → 20246

Parity: odd

Prime: No

Previous Prime: 20233

Next Prime: 20249

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 5 × 4049

Divisors: 1, 5, 4049, 20245

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111100010101

Octal: 47425

Duodecimal: B871

Hexadecimal: 4f15

Square: 409860025

Square Root: 142.28492541376264

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

Partial sums of A151791. A151792

Antidiagonal sums of the convolution array A213753. A213755

Number of nondecreasing arrangements of 6 numbers x(i) in -(n+4)..(n+4) with the sum of sign(x(i))*2^|x(i)| zero. A187990

Numbers k such that the continued fraction for sqrt(k) has period 61. A20400

G.f.: ∑_n>=0 xⁿ/(1 - x²*(1+x)ⁿ). A340775

Number of pairs (p,q) of primes p <= q <= r=prime(n) such that the cyclotomic polynomial φ(p·q*r) has no coefficient > 1 in absolute value. A159908

Number of pairs (p,q) of odd primes p < q < r=prime(n) such that the cyclotomic polynomial φ(p·q*r) has no coefficient > 1 in absolute value. A159909

Strong pseudoprimes to base 19. A20245