Properties of the Number 20706

Twenty Thousand Seven Hundred Six

Basics

Value: 20705 → 20706 → 20707

Parity: even

Prime: No

Previous Prime: 20693

Next Prime: 20707

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 7 × 17 × 29

Divisors: 1, 2, 3, 6, 7, 14, 17, 21, 29, 34

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 101000011100010

Octal: 50342

Duodecimal: BB96

Hexadecimal: 50e2

Square: 428738436

Square Root: 143.8957956300322

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

T(n,k)=1/36 the number of (n+2)X(k+2) 0..2 arrays with each 3X3 subblock containing two of one value, two of another, and five of the last. A184457

26-gonal numbers: a(n) = n*(12·n-11). A255185

Least positive integer m with prime(m)+2 and prime(prime(m))+2 both prime such that prime(m·n)+2 and prime(prime(m·n))+2 are both prime. A259487

Numbers that are the sum of seven fourth powers in six or more ways. A345572

Numbers that are the sum of seven fourth powers in seven or more ways. A345573

Numbers that are the sum of seven fourth powers in exactly seven ways. A345829

Numbers k such that ω(k) = 5 and the largest prime factor of k equals the sum of its remaining distinct prime factors, where ω(k) = A001221(k). A383729

Smallest triangular number which is a multiple (>1) of the n-th triangular number. A68084

Numbers n such that sum of distinct primes dividing n is divisible by the largest prime dividing n. Also n is neither a prime, nor a true power of prime and n is squarefree. Squarefree solutions of A071140. A71141

Irregular triangle read by row: T(n,k), n>=1, k>=1, in which column k lists the numbers of A000716 multiplied by A000330(k), and the first element of column k is in row A000217(k). A252117