Properties of the Number 20912

Twenty Thousand Nine Hundred Twelve

Basics

Value: 20911 → 20912 → 20913

Parity: even

Prime: No

Previous Prime: 20903

Next Prime: 20921

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ⁴ × 1307

Divisors: 1, 2, 4, 8, 16, 1307, 2614, 5228, 10456, 20912

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000110110000

Octal: 50660

Duodecimal: 10128

Hexadecimal: 51b0

Square: 437311744

Square Root: 144.60981986020175

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

Even composite integers m such that A006190(m)² == 1 (mod m). A337235

Expansion of 1/( (1-x)*(1 + x² + x³) ). A77889

Even Padovan numbers divided by 2. A135619

Number of subsets of Z_n such that every ordered pair of distinct elements has a different sum. A382400

Number of transitions necessary for a Turing machine to compute the differences between consecutive primes (primes written in unary), when using the instruction table below. A78612

a(n) = ceiling(A000931(n)/2). A173692

Number of nondecreasing arrangements of n+2 numbers in 0..6 with each number being the sum mod 7 of two others. A183909

Number of 2 X 2 matrices with all elements in {0,1,...,n} and determinant in {0,1,...,n}. A209995

Numbers equal to the arithmetic derivative of their Euler totient function. A248815

Smallest k such that A285481(k) >= n, i.e., lowest d where the smallest integer radius needed for a d-dimensional ball to have a volume >= 1 is at least n. A285482