Properties of the Number 20783

Twenty Thousand Seven Hundred Eighty-Three

Basics

Value: 20782 → 20783 → 20784

Parity: odd

Prime: No

Previous Prime: 20773

Next Prime: 20789

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 7 × 2969

Divisors: 1, 7, 2969, 20783

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000100101111

Octal: 50457

Duodecimal: 1003B

Hexadecimal: 512f

Square: 431933089

Square Root: 144.16310207539237

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

Positive fundamental solution y(n) of the generalized Pell equation X² - D(n) Y(n) = 2 with D(n) = A261246(n). A261248

y-value of the smallest solution to 2·x² - p·y² = (-1)^(p+1/4), p = A002145(n). A306619

Denominators of continued fraction convergents to sqrt(382). A41725

Frobenius number of the numerical semigroup generated by three consecutive pentagonal numbers. A69757

The y member of the positive proper fundamental solution (x = x2(n), y = y2(n)) of the second class for the Pell equation x² - D(n)*y² = +8 for even D(n) = A264354(n). A264439

Numbers k such that 179·2^k+1 is prime. A32466

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 555", based on the 5-celled von Neumann neighborhood. A272922

Decimal expansion of 1/sqrt(26). A20783