Properties of the Number 20604

Twenty Thousand Six Hundred Four

Basics

Value: 20603 → 20604 → 20605

Parity: even

Prime: No

Previous Prime: 20599

Next Prime: 20611

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 17 × 101

Divisors: 1, 2, 3, 4, 6, 12, 17, 34, 51, 68

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000001111100

Octal: 50174

Duodecimal: BB10

Hexadecimal: 507c

Square: 424524816

Square Root: 143.54093492798492

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

a(n) = prime(n)² - prime(n²). Commutator of (primes, squares) at n. A123914

G.f. satisfies: A(x) = (1 - 3·x*A(x))² * (4·A(x) - 3). A231616

Long leg B of primitive Pythagorean triangles such that perimeters are Averages of twin prime pairs, q=p+1, a=q²-p², c=q²+p², b=2·p*q, s=a+b+c, s-+1 are primes. A155174

Triangle read by rows: T(n,k) is the number of embeddings on the sphere of 2-connected planar graphs with n nodes and k faces up to orientation preserving isomorphisms, n >= 3, k=2..2·n-4. A342059

Irregular table read by rows: T(n,k) is the number of k-sided polygons formed, for k>=3, in a square when straight line segments connect the n+1 points along each edge that divide it into n equal parts to the n+1 points on the edge on the opposite side of the square. A355841

Numbers k such that k² + k + 4 is a palindrome. A27716

12 times pentagonal numbers: a(n) = 6·n*(3·n-1). A153792

Row sums of triangle A182700. A182704

The number of regions inside a 2 by 1 ellipse formed by the straight line segments mutually connecting all points formed by dividing the ellipse into 2n equal angle sectors from its origin. A341688

Long legs of the only primitive Pythagorean triple whose inradius is the n-th prime and whose short leg is an odd number. A367573