Properties of the Number 18420

Eighteen Thousand Four Hundred Twenty

Basics

Value: 18419 → 18420 → 18421

Parity: even

Prime: No

Previous Prime: 18413

Next Prime: 18427

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 ² × 3 × 5 × 307

Divisors: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100011111110100

Octal: 43764

Duodecimal: A7B0

Hexadecimal: 47f4

Square: 339296400

Square Root: 135.72030061858837

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 k such that 2^k + 33 is prime. A247953

Minimal positive solution z of Pell equation z² - A077426(n)*t² = -4. A78356

a(n) = 3·a(n-1) - 2·a(n-2) with a(0)=24 and a(1)=60. A182464

Triangle read by rows: T(n,k) is the number of noncrossing trees with n edges and k leaves at level 1. A101371

Expansion of ∏_k>0 theta₃(q^k)/theta₄(q^k), where theta₃() and theta₄() are the Jacobi θ functions. A320967

Number of ternary paths of length 3·n having exactly 2 hills. A374836

Array read by antidiagonals: T(n,k) is the number of nonequivalent essentially parallel series-parallel networks with longest path of at most n edges and largest cut set of at most k edges. A391485

Total number of edges in all rooted trees on n nodes. A95350

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 931", based on the 5-celled von Neumann neighborhood. A273790

Number of (n+1) X 3 0..1 arrays with the number of rightwards and downwards edge increases in each 2 X 2 subblock differing from the number in all its horizontal and vertical neighbors. A205066