Properties of the Number 20696

Twenty Thousand Six Hundred Ninety-Six

Basics

Value: 20695 → 20696 → 20697

Parity: even

Prime: No

Previous Prime: 20693

Next Prime: 20707

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ³ × 13 × 199

Divisors: 1, 2, 4, 8, 13, 26, 52, 104, 199, 398

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 101000011011000

Octal: 50330

Duodecimal: BB88

Hexadecimal: 50d8

Square: 428324416

Square Root: 143.86104406683555

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)=Number of nXk 0..4 arrays with each element·equal to the number of its horizontal and vertical neighbors equal to 3,0,1,1,1 for x=0,1,2,3,4. A197409

T(n,k)=Number of nXk 0..4 arrays with each element·equal to the number of its horizontal and vertical neighbors equal to 4,0,1,1,1 for x=0,1,2,3,4. A197431

Fourth left hand column of triangle A163940. A163944

Indices of primes in A000219. A285216

Number of tilings of a 5 X n rectangle using n pentominoes of shapes U, Y, Z. A352421

Length of period of continued fraction expansion of square root of 3ⁿ+1. A62328

Number of n X 2 0..4 arrays with each element·equal to the number its horizontal and vertical neighbors equal to 3,0,1,1,1 for x=0,1,2,3,4. A197403

a(n) = 4·n*(n² - 3·n - 1)/3. A275876

Let a,b,c,...k be all divisors of n; a(n) = (a+1)*(b+1)*...*(k+1). A20696

G.f. A(x) satisfies [x^2·n] A(x)^5·n = -5 and [x^2·n+1] A(x)^5·n+2 = [x^2·n+1] A(x)^5·n+3 for n >= 1. A377096