Properties of the Number -20606

Twenty Thousand Six Hundred Six

Basics

Value: -20607 → -20606 → -20605

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 × 10303

Divisors: 1, 2, 10303, 20606

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101000001111110

Octal: -50176

Duodecimal: -BB12

Hexadecimal: -507e

Square: 424607236

Square Root: 143.547901412734

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

T(n,k)=Number of nXk 0..2 arrays with exactly floor(nXk/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order. A222673

Numbers n such that in n³ the parity of digits alternates. A30159

Semiprimes of the form 2*(m² + m + 1) (implying that m² + m + 1 is a prime). A107317

Expansion of (1-x)/(1-x-2x²+x⁴). A52969

Numbers n such that φ((prime(n)+1)/2)=σ(n). A68473

The (1,4)-entry in the matrix Mⁿ, where M is the 4 X 4 matrix {{0, -1, -1, 1}, {1, -1, 0, 0}, {0, 1, 1, 0}, {0, 0, 1, 1 }}. A122789

Number of nX4 0..2 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order. A222669

Number of nX6 0..2 arrays with exactly floor(nX6/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order. A222671

Numbers k such that σ(k + σ(k)) = σ((k+1) + σ(k+1)). A246915

G.f.: ∑_k>=0 x^k² * ∏_j=1..k 1/(1 - x^j)³. A376709