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Properties of the Number 20509

Twenty Thousand Five Hundred Nine

Basics

Value: 20508 → 20509 → 20510

Parity: odd

Prime: Yes

Previous Prime: 20507

Next Prime: 20521

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 20509

Divisors: 1, 20509

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 101000000011101

Octal: 50035

Duodecimal: BA51

Hexadecimal: 501d

Square: 420619081

Square Root: 143.20963654726592

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

Primes p such that p, p+12, p+24 are consecutive primes. A52188
Primes p of the form 2·prime(k) + 3 such that 2·prime(k+1) + 3 is the next prime after p. A89528
a(n) is the number of positive integers k for which ∑i=1..j (pi+ei) = n, where p1e_1*...*pje_j is the prime factorization of k. A382330
Positive integers n such that prime(n+i) is a primitive root modulo prime(n+j) for any distinct i and j among 0, 1, 2, 3. A243839
Position of the first occurrence of n in A337474. A337476
Upper twin primes of upper twin prime index. A88463
Primes in A051022. A92908
Primes that remain prime through 4 iterations of function f(x) = 5·x + 6. A23315
Twin primes p such that the absolute difference of p and the reverse of its twin is a twin prime. A342216
Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 86 ones. A31854