Properties of the Number 20881

Twenty Thousand Eight Hundred Eighty-One

Basics

Value: 20880 → 20881 → 20882

Parity: odd

Prime: No

Previous Prime: 20879

Next Prime: 20887

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 7 × 19 × 157

Divisors: 1, 7, 19, 133, 157, 1099, 2983, 20881

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000110010001

Octal: 50621

Duodecimal: 10101

Hexadecimal: 5191

Square: 436016161

Square Root: 144.50259513240584

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

a(n) = (n² - n + 1)*(n² + n + 1). A59826

"CIK" (necklace, indistinct, unlabeled) transform of 1,2,3,4,... A32198

Numbers whose square is palindromic in base 12. A29737

Sums of distinct powers of 12. A33048

Number of admissible basis in the postage stamp problem for n denominations and h = 5 stamps. A167812

Number of partitions of n which contain their signature as a subpartition. A118052

Strong pseudoprimes to base 13. A20239

The sequence e when b=[ 1,0,1,1,1,... ]. A42953

Number of points in Nⁿ of norm <= 2. A55417

Number of (w,x,y) with all terms in {0,...,n} and max(w,x,y) >= 2·min(w,x,y). A213390