Properties of the Number 20457

Twenty Thousand Four Hundred Fifty-Seven

Basics

Value: 20456 → 20457 → 20458

Parity: odd

Prime: No

Previous Prime: 20443

Next Prime: 20477

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 2273

Divisors: 1, 3, 9, 2273, 6819, 20457

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100111111101001

Octal: 47751

Duodecimal: BA09

Hexadecimal: 4fe9

Square: 418488849

Square Root: 143.02796929272262

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

Sum of 12 nonzero 8th powers. A3390

Numbers k which have a factorization k = f1·f2*...*fr where the digits of {k, f1, f2, ..., fr} together give 0,1,...,9 exactly once. A370970

Number of n-digit lunar primes. A87636

Composite numbers with properties that its digits (which may appear with multiplicity) may not appear in any of its factors (wherein the digits may also appear with multiplicity) and the combined digits of the product and the factors must have at least one of each of the ten digits. A370972

Number of triangulations of the cyclic polytope C(n, n-4). A66342

Numbers k which use half of the ten digits such that they have at least one factorization k=p·q that uses remaining half of the digits that are not in k. A195814

Numbers n = p·q, where n, p, and q together contain all 10 digits at least once. A253172

Total number of polydivisible numbers in base n. A271374

Numerators of continued fraction convergents to sqrt(754). A42452

Numerator of best rational approximation x/y of sqrt(k), y<=k, with k given by A306972. The corresponding denominators are given in A306974. A306973