Properties of the Number 20386

Twenty Thousand Three Hundred Eighty-Six

Basics

Value: 20385 → 20386 → 20387

Parity: even

Prime: No

Previous Prime: 20369

Next Prime: 20389

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 × 10193

Divisors: 1, 2, 10193, 20386

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100111110100010

Octal: 47642

Duodecimal: B96A

Hexadecimal: 4fa2

Square: 415588996

Square Root: 142.77955035648486

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

Array read by antidiagonals: T(n,k) is the number of unlabeled k-gonal 2-trees with n polygons, n >= 0, k >= 2. A340811

a(n) = S1(n,5), where S1(n,t) = ∑_k=0..n k^t * ∑_j=0..k binomial(n,j). A89662

Number of unlabeled pentagonal 2-trees with n pentagons. A94611

a(n) = n³ - 2·n² + 2. A100109

Total sum of parts of multiplicity 3 in all partitions of n. A222731

a(0) = 1, a(n) = 26·n² + 2 for n>0. A10016

Number of 0..7 arrays of length n with each element differing from at least one neighbor by something other than 1, starting with 0. A221541

Number of 0..n arrays of length 6 with each element differing from at least one neighbor by something other than 1, starting with 0. A221544

Coefficients of recurrence for rows and columns of A250544 and rows of A250691. A255002

Expansion of (1 - x)/(1 - 3·x - 2·x² - 2·x³). A77839