Properties of the Number 20419

Twenty Thousand Four Hundred Nineteen

Basics

Value: 20418 → 20419 → 20420

Parity: odd

Prime: No

Previous Prime: 20411

Next Prime: 20431

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 7 × 2917

Divisors: 1, 7, 2917, 20419

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100111111000011

Octal: 47703

Duodecimal: B997

Hexadecimal: 4fc3

Square: 416935561

Square Root: 142.89506639488994

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 aperiodic relatively prime trees with n nodes. A317708

Semiprimes in A003215. A113530

Number of fib101 primes (A095089) in range ]2ⁿ,2ⁿ⁺¹]. A95069

Triangle read by rows: T(n,k) number of ways of partitioning the (n+4)-element multiset {1,1,1,1,1,2,3,...,n} into exactly k nonempty parts, n >= 0 and 1 <= k <= n + 4. A291119

Number of triangles that can be built from rods with lengths 1,2,...,n by using and concatenating all rods. A160455

Erroneous version of A271811 (but for odd primes only). A271664

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 537", based on the 5-celled von Neumann neighborhood. A272792

Related to population of numbers of form x² + y². A694

Numbers k such that the continued fraction for sqrt(k) has period 80. A20419

Square array read by antidiagonals upwards in which row k has k as its first term and each subsequent term is the least possible value such that the sum of any 2 or more terms does not equal a prime. A305579