Properties of the Number 20709

Twenty Thousand Seven Hundred Nine

Basics

Value: 20708 → 20709 → 20710

Parity: odd

Prime: No

Previous Prime: 20707

Next Prime: 20717

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 13 × 59

Divisors: 1, 3, 9, 13, 27, 39, 59, 117, 177, 351

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000011100101

Octal: 50345

Duodecimal: BB99

Hexadecimal: 50e5

Square: 428862681

Square Root: 143.90621946253748

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 that are the sum of 5 positive 9th powers. A3394

Numbers that are the sum of 9 nonzero 8th powers. A3387

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock summing to 4. A183632

Starting numbers for which the RATS sequence has eventual period 3. A114613

T(n,k)=Number of nXk 0..2 arrays with every row having the same least squares slope fit to a straight line, and every column the same least squares slope fit to a straight line, with a single point array taken as having zero slope. A223022

Number of (n+1) X 2 0..2 arrays with every 2·2 subblock summing to 4. A183624

Product of successive primes minus 2. A124669

Numbers that are the sum of at most 5 positive 9th powers. A4889

Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 19 (most significant digit on right). A61972

(k²)-th k-smooth number for k = prime(n). A133581