Properties of the Number 20406

Twenty Thousand Four Hundred Six

Basics

Value: 20405 → 20406 → 20407

Parity: even

Prime: No

Previous Prime: 20399

Next Prime: 20407

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 19 × 179

Divisors: 1, 2, 3, 6, 19, 38, 57, 114, 179, 358

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111110110110

Octal: 47666

Duodecimal: B986

Hexadecimal: 4fb6

Square: 416404836

Square Root: 142.84957122791795

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

Convolution of A000203 with itself. A385

Generalized Stirling numbers, [n+2,n]_2. A1701

Numbers k such that the coefficient of x^k in the expansion of ∏_j>=1 (1 - x^j)⁵ is zero. A302057

Indices n where a run of primes begins in A375564. A376192

Expansion of ∏_k>=1 B(x^k), where B(x) is the g.f. of A003106. A327691

Consider all integer triples (i,j,k), j,k>0, with i³=j³+binomial(k+2,3), ordered by increasing i; sequence gives k values. A54236

a(1) = 0, a(2) = 0; for n > 2, a(n) - a(n-3) - a(n-5) - ... - a(n-p) = n if n is prime, otherwise = 0, where p = largest prime < n. A2123

Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,5. A64239

Triangle read by rows: T(n,k) is the number of non-backtracking walks on Z² of length n that are active for k steps, where the walk is initially active and turns in the walk toggle the activity. A307584

Positions of records in A366091. A366065