Properties of the Number 20219

Twenty Thousand Two Hundred Nineteen

Basics

Value: 20218 → 20219 → 20220

Parity: odd

Prime: Yes

Previous Prime: 20201

Next Prime: 20231

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 20219

Divisors: 1, 20219

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100111011111011

Octal: 47373

Duodecimal: B84B

Hexadecimal: 4efb

Square: 408807961

Square Root: 142.19353009191383

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

Numbers n such that (19ⁿ - 2ⁿ)/17 is prime. A229542

Primes p whose period of reciprocal equals (p-1)/11. A56216

Prime time primes on 6-digit clocks, second definition: primes of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60. A295013

Prime time numbers on 6-digit clocks: numbers of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60. A295014

Area under Motzkin excursions. A57585

Triangle read by rows: T(n,k) is the number of unlabeled connected multigraphs with n edges on k nodes and degree >= 3 at each node, loops allowed, n >= 2, 1 <= k <= floor(2·n/3). A360862

Primes p such that 2*(p²-1) - 1 and 2*(p²-1) + 1 are also primes. A247101

Lengths of runs of the initial digits of semiprimes in decimal representation, cf. A239634. A239639

Primes congruent to 41 mod 59. A142768

Primes congruent to 28 mod 61. A142826