Properties of the Number 19220

Nineteen Thousand Two Hundred Twenty

Basics

Value: 19219 → 19220 → 19221

Parity: even

Prime: No

Previous Prime: 19219

Next Prime: 19231

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 5 × 31 ²

Divisors: 1, 2, 4, 5, 10, 20, 31, 62, 124, 155

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100101100010100

Octal: 45424

Duodecimal: B158

Hexadecimal: 4b14

Square: 369408400

Square Root: 138.63621460498698

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..1 arrays with no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors. A283857

a(n) = 20·n². A195322

G.f. satisfies: A(x) = (1 + 3·x*A(x))² * (3 + A(x)) / 4. A231618

a(n) = n*(25·n - 39)/2. A263231

Sum of first n terms divides the concatenation of the first n terms. A166064

Numbers n such that the sum of n consecutive positive cubes is a cube for some initial starting number k. A240970

Expansion of ∏_k>0 (1 - k²*x^k)^1/k. A294620

Number of binary squares of length 2n that neither begin nor end with a shorter square. A323443

Nonnegative values·of solutions (x, y) to the Diophantine equation x² + (x + 31²)² = y². A331265

Number of nX5 0..1 arrays with no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors. A283854