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Properties of the Number 19920

Nineteen Thousand Nine Hundred Twenty

Basics

Value: 19919 → 19920 → 19921

Parity: even

Prime: No

Previous Prime: 19919

Next Prime: 19927

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 4 × 3 × 5 × 83

Divisors: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100110111010000

Octal: 46720

Duodecimal: B640

Hexadecimal: 4dd0

Square: 396806400

Square Root: 141.1382301150188

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

Number of squarefree integers not exceeding 2n. A143658
The (1,1)-entry of the matrix Mn, where M is the 5 X 5 matrix [[0,1,0,0,0],[0,0,1,0,0], [0,0,0,1,0], [0,0,0,0,1], [1,0,-1,1,1]]. A107293
Least k such that the k-th squarefree number has exactly n ones in its binary expansion. A372541
Square array A(n,k) = (2·n)! [xn] BesselI(0, 2·sqrt(x))k read by antidiagonals. A287318
Composition of the binomial transform of Fibonacci numbers and the Catalan transform of Fibonacci numbers. A219312
Number of connected nonnegative integer matrices with sum of entries equal to n and no zero rows or columns. A321585
Numbers k such that d(φ(k)) = φ(d(k)), where d=A000005 and φ=A000010. A78148
T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two sums of the central column and central row nondecreasing horizontally and vertically. A258522
a(n) = dotproduct(1,2,...,n)*(4,5,...,n,1,2,3). A26040
Largest achievable determinant of a 4 X 4 matrix whose elements are 16 distinct integers chosen from the range -n...n. A97695