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Properties of the Number 19930

Nineteen Thousand Nine Hundred Thirty

Basics

Value: 19929 → 19930 → 19931

Parity: even

Prime: No

Previous Prime: 19927

Next Prime: 19937

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 × 5 × 1993

Divisors: 1, 2, 5, 10, 1993, 3986, 9965, 19930

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100110111011010

Octal: 46732

Duodecimal: B64A

Hexadecimal: 4dda

Square: 397204900

Square Root: 141.1736519326464

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 0..k arrays x(0..n+1) of n+2 elements without any two consecutive increases or two consecutive decreases. A200838
a(n) is the number of integers whose sum of divisors is 6n. A48253
1/16 the number of (n+1) X 9 0..3 arrays with all 2 X 2 subblocks having the same four values. A184038
Sum of squares of numbers less than n that do not divide n. A276984
Numbers k such that the continued fraction for sqrt(k) has period 61. A20400
Row 3 of square array defined in A047671. A47672
Numbers k such that if k = a·b, then a+b = reversal(k) for some integers a,b > 1. A161791
Number of 0..5 arrays x(0..n+1) of n+2 elements without any two consecutive increases or two consecutive decreases. A200835
Number of 0..n arrays x(0..5) of 6 elements without any two consecutive increases or two consecutive decreases. A200841
Number of n X 3 0..1 arrays with rows and antidiagonals unimodal and columns nondecreasing. A224141