Properties of the Number -20480

Twenty Thousand Four Hundred Eighty

Basics

Value: -20481 → -20480 → -20479

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ¹² × 5

Divisors: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101000000000000

Octal: -50000

Duodecimal: -BA28

Hexadecimal: -5000

Square: 419430400

Square Root: 143.10835055998655

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: Yes

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) = 2ⁿ*(1-n). A159964

Determinants of 4 X 4 matrices of 16 consecutive primes. A118799

a(n) = -2·a(n-1) + 4·a(n-3), with a(0) = 1, a(1) = -2, a(2) = 4. A99211

Diagonal of A129819. A130668

Inverse binomial transform of A166517. A166577

Triangle, read by rows, T(n, k) = (-1)^k * (n-k+1)ⁿ⁺² * binomial(n+1, k). A176860

Expansion of cosh(tanh(x))/exp(x). A9170

Expansion of cosh(x)/exp(tanh(x)). A9187

Determinants of the (floor(n/2) - 1) X (floor(n/2) - 1) matrix whose (i,j)-th entry is the intersection number on M_0,n of the F-curve F_1,1,i,n-i-2 and the divisor of the conformal blocks bundle associated to the Lie algebra sl_n, the level 1 and the n-tuple of weights omega_jⁿ. A174421

Expansion of (1+x)/(1-4·x). A3947