Properties of the Number 19924

Nineteen Thousand Nine Hundred Twenty-Four

Basics

Value: 19923 → 19924 → 19925

Parity: even

Prime: No

Previous Prime: 19919

Next Prime: 19927

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 17 × 293

Divisors: 1, 2, 4, 17, 34, 68, 293, 586, 1172, 4981

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110111010100

Octal: 46724

Duodecimal: B644

Hexadecimal: 4dd4

Square: 396965776

Square Root: 141.1523999087511

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

Number of squarefree integers in closed interval [2ⁿ, -1 + 2·2ⁿ], i.e., among 2ⁿ consecutive numbers beginning with 2ⁿ. A77643

Numbers k such that 4k+1 is a palindromic prime. A192261

Monotonically increasing sequence of least positive integers, a(1)=1, such that the self-convolution produces all squares. A87150

a(n) = ∑_k=1..n k·lcm(k,k')/gcd(k,k'), where k' is arithmetic derivative of k. A190122

a(1) = 1; a(2) = 1; for n >= 3, a(n) = a(n-1) / gcd(a(n-1), n-1) + a(n-2) / gcd(a(n-2), n-2). A330806

a(n) = (8·n³ + 15·n² + 13·n)/6. A332698

Number of n-step self-avoiding walks on one quadrant of a 2D square lattice where the walk cannot step to the smaller square ring of numbers than the ring it is currently on. A348009

G.f. A(x) satisfies A(x)³ = A( x·A(x)²*(1 + A(x))² ). A391523

Decimal expansion of tangent of 26 degrees. A19924