Properties of the Number 20241

Twenty Thousand Two Hundred Forty-One

Basics

Value: 20240 → 20241 → 20242

Parity: odd

Prime: No

Previous Prime: 20233

Next Prime: 20249

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 13 × 173

Divisors: 1, 3, 9, 13, 39, 117, 173, 519, 1557, 2249

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111100010001

Octal: 47421

Duodecimal: B869

Hexadecimal: 4f11

Square: 409698081

Square Root: 142.2708684165525

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 numbers on 6-digit clocks: numbers of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60. A295014

Expansion of e.g.f. exp(x·G(x)) where G(x) = 1 + x·G(x)⁴ is the g.f. of A002293. A380513

a(n) = greatest k such that A155043(k+A262509(n)) < A155043(A262509(n)). A262909

Perturbation expansion in quantum field theory: scalar case in 6 spacetime dimensions. A51862

a(n) = 10·a(n-1) - 23·a(n-2) for n > 1; a(0) = 1, a(1) = 9. A163349

Number of set partitions of [n] such that nine is a multiple of each block size. A275427

Binomial transform of [1, 3, 4, 3, 2, 0, 0, 0, ...]. A136395

G.f.: (1+x²+x³)/(1-x-x²-x⁴-x⁵). A188223

Integers 1 through n written in primorial base, summed as if decimal. A122613

Nonprime numbers k of the form 4·m+1 such that ∑_j=0..k-1 2^j * binomial(3·j, j) == 1 (mod k). A373747