19993165 has 8 divisors (see below), whose sum is σ = 24145560. Its totient is φ = 15892032.

The previous prime is 19993157. The next prime is 19993201. The reversal of 19993165 is 56139991.

It can be written as a sum of positive squares in 4 ways, for example, as 2579236 + 17413929 = 1606^2 + 4173^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19993165 - 2³ = 19993157 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11950 + ... + 13519.

It is an arithmetic number, because the mean of its divisors is an integer number (3018195).

Almost surely, 2^19993165 is an apocalyptic number.

It is an amenable number.

19993165 is a deficient number, since it is larger than the sum of its proper divisors (4152395).

19993165 is a wasteful number, since it uses less digits than its factorization.

19993165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25631.

The product of its digits is 65610, while the sum is 43.

The square root of 19993165 is about 4471.3717134678. The cubic root of 19993165 is about 271.4108363956.

The spelling of 19993165 in words is "nineteen million, nine hundred ninety-three thousand, one hundred sixty-five".