Properties of the Number -2420

Four Hundred Twenty

Basics

Value: -2421 → -2420 → -2419

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 5 × 11 ²

Divisors: 1, 2, 4, 5, 10, 11, 20, 22, 44, 55

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: -100101110100

Octal: -4564

Duodecimal: -1498

Hexadecimal: -974

Square: 5856400

Square Root: 49.193495504995376

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

a(n) = ∑_k=1..n μ(k)*k². A336276

Expansion of ∏_k>=1 (1 - x^k)¹⁵. A10822

Expansion of ∑_k>0 x^2·k/(1+x^k)⁵. A363613

a(n) = n! * ∑_k=0..n (-k)^n-k * (n-k)^k/k!. A351780

Least entry in character table of the symmetric group S_n. A61220

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 A384895. A384900

a(n) = ∑_i=1..n i²*(-1)^ceiling(sqrt(i)). A392677

Expansion of e.g.f.: exp(tanh(x)-log(x+1))=1+1/2!*x²-4/3!*x³+9/4!*x⁴-48/5!*x⁵... A13495

a(n) = [(x·y)ⁿ] ∏_k>=1 (1 - x^k - y^k)ⁿ. A381012

Second pentagonal numbers: a(n) = n*(3·n + 1)/2. A5449