Properties of the Number 20425

Twenty Thousand Four Hundred Twenty-Five

Basics

Value: 20424 → 20425 → 20426

Parity: odd

Prime: No

Previous Prime: 20411

Next Prime: 20431

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 5 ² × 19 × 43

Divisors: 1, 5, 19, 25, 43, 95, 215, 475, 817, 1075

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111111001001

Octal: 47711

Duodecimal: B9A1

Hexadecimal: 4fc9

Square: 417180625

Square Root: 142.9160592795645

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

Number of integer partitions of n whose greatest part is at most one more than the sum of the other parts. A336106

Pseudoprimes to base 7. A5938

Triangle read by rows: T(n,m) (n >= m >= 1) = number of vertices formed by drawing the lines connecting any two of the 2*(m+n) perimeter points of an m X n grid of squares. A331453

Indices of the start of a string of 24 consecutive squares whose sum is a square. A94196

Triangle read by rows: T(n,k) is the number of set partitions of {1,2,...,n} in which the size of the last block is k, 1<=k<=n; the blocks are ordered with increasing least elements. A124496

Fifth-from-right diagonal of triangle A121207. A45500

Number of integer partitions whose sum of primes of parts equals their sum of parts plus n. A331387

Euler pseudoprimes to base 7: composite integers such that abs(7^{(n - 1}/2)) == 1 mod n. A262054

Pseudoprimes to base 7 that are not squarefree. A243089

Third diagonal sequence of the Sheffer triangle A094816 (special Charlier). A290312