Properties of the Number 20140

Twenty Thousand One Hundred Forty

Basics

Value: 20139 → 20140 → 20141

Parity: even

Prime: No

Previous Prime: 20129

Next Prime: 20143

Digit Sum: 7

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 5 × 19 × 53

Divisors: 1, 2, 4, 5, 10, 19, 20, 38, 53, 76

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100111010101100

Octal: 47254

Duodecimal: B7A4

Hexadecimal: 4eac

Square: 405619600

Square Root: 141.91546779685433

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) is the concatenation of n and 7n. A9441

Sum of the squares of the parts in the partitions of n into two distinct parts. A294286

Number of compositions of n with exactly 7 transitions between different parts. A244719

G.f.: (t⁵ + 2·t⁴ + t³ + 2·t² + t) / (t⁶ + t⁵ - 2·t⁴ - 5·t³ - 2·t² + t + 1). A180510

Ulam numbers u such that 5·u is also an Ulam number. A287613

a(n) = 1 + ((6·n-1)*2ⁿ + (-1)ⁿ)/3. A174836

Array read by antidiagonals: T(m,n) = number of step cyclic shifted sequences of length n using a maximum of m different symbols. A285548

a(n) = ∑_{k = 0..n-1} binomial(n,k)²*binomial(n+k-1,k). A361715

Pseudoprimes to base 12. A20140