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Properties of the Number 19940

Nineteen Thousand Nine Hundred Forty

Basics

Value: 19939 → 19940 → 19941

Parity: even

Prime: No

Previous Prime: 19937

Next Prime: 19949

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 2 × 5 × 997

Divisors: 1, 2, 4, 5, 10, 20, 997, 1994, 3988, 4985

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

603 Try Today's Challenge

Representations

Binary: 100110111100100

Octal: 46744

Duodecimal: B658

Hexadecimal: 4de4

Square: 397603600

Square Root: 141.20906486483082

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 nonzero 8th powers. A3383
Numbers k such that k, k+1, k+2 and k+3 have the same number of divisors. A6601
a(n) is minimal such that prime factorizations of a(n), ..., a(n)+n-1 have same exponents. A34173
Smallest of 4 consecutive numbers each divisible by a square. A70284
T(n,k)=Number of (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 with each element having directed index change 0,1 0,-1 0,2 1,0 or -1,0. A264257
Starts for strings of at least five consecutive nonsquarefree numbers. A78144
Numbers k with prime signature(k) = prime signature(k+1) = prime signature(k+2) = prime signature(k+3). A175590
T(n,k)=Number of (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 with each element having directed index change 0,1 0,-1 0,2 1,0 -1,0 or 2,0. A264163
T(n,k) is the start of the first run of exactly k consecutive integers having exactly 2n divisors. Table read by rows. A292580
Square array read by antidiagonals: a(n, d) is the smallest number that begins an arithmetic progression with common difference d of n numbers with the same prime signature. A113456