Properties of the Number 20910

Twenty Thousand Nine Hundred Ten

Basics

Value: 20909 → 20910 → 20911

Parity: even

Prime: No

Previous Prime: 20903

Next Prime: 20921

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 5 × 17 × 41

Divisors: 1, 2, 3, 5, 6, 10, 15, 17, 30, 34

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

603 Try Today's Challenge

Representations

Binary: 101000110101110

Octal: 50656

Duodecimal: 10126

Hexadecimal: 51ae

Square: 437228100

Square Root: 144.60290453514412

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

Coefficients of expansion of Jacobi nome q in certain powers of (1/2)*(1 - sqrt(k')) / (1 + sqrt(k')). A2103

55 'Reverse and Add' steps are needed to reach a palindrome. A65322

Triangular numbers that are sums of two consecutive primes. A111163

(1/4) * number of ways to select 3 distinct collinear points from a square of grid points with side length n. A320540

a(n) = 3·n*(6·n + 1). A144314

Smallest ∏_i:λ prime(i) for any complete partition λ of n. A259941

a(0) = 1 and a(n) = (1/n) * ∑_k=1..n (-2)^n-k * binomial(n,k) * binomial(n+(n-1)*k,k-1) for n > 0. A336714

Products of members of pairs in A075333. A75337

Triangular numbers whose internal digits form a triangular number. Or triangular number such that deleting the MSD and LSD leaves a triangular number. A77366

Gaps associated with the arithmetic progressions of semiprimes in A096003. A97824