Properties of the Number 20487

Twenty Thousand Four Hundred Eighty-Seven

Basics

Value: 20486 → 20487 → 20488

Parity: odd

Prime: No

Previous Prime: 20483

Next Prime: 20507

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 6829

Divisors: 1, 3, 6829, 20487

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000000000111

Octal: 50007

Duodecimal: BA33

Hexadecimal: 5007

Square: 419717169

Square Root: 143.13280546401654

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

Numbers of the form k + wt(k) for exactly four distinct k, where wt(k) = A000120(k) is the binary weight of k. A227915

G.f.: A(x) = exp( ∑_n>=1 σ(n)²*xⁿ/n ), a power series in·with integer coefficients. A156302

G.f. A(x) satisfies: ∑_n>=0 A(x)⁽ⁿ⁺¹²) * xⁿ = ∑_n>=0 (1 + A(x)ⁿ⁺²)ⁿ * xⁿ. A326287

Number of rooted forests with n nodes in which each component contains at least two nodes. A174145

Number of ordered triples (w,x,y) with all terms in {1,...,n} and w²>x²+y². A211637

Trisection of A007294. A73471

Potential magic constants of 9 X 9 magic squares composed of consecutive primes. A191679

Odd numbers k such that φ(k) and cototient(k) have the same prime signature. A280927

Number of nondecreasing arrangements of n numbers in -6..6 with sum zero and sum of squares not greater than n·42/3. A183924

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of B(x)^k, where B(x) is the g.f. of A213093. A384866