19664885 has 16 divisors (see below), whose sum is σ = 24748416. Its totient is φ = 14971968.

The previous prime is 19664873. The next prime is 19664893. The reversal of 19664885 is 58846691.

It is a cyclic number.

It is not a de Polignac number, because 19664885 - 2⁸ = 19664629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35027 + ... + 35583.

It is an arithmetic number, because the mean of its divisors is an integer number (1546776).

Almost surely, 2^19664885 is an apocalyptic number.

It is an amenable number.

19664885 is a deficient number, since it is larger than the sum of its proper divisors (5083531).

19664885 is a wasteful number, since it uses less digits than its factorization.

19664885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892.

The product of its digits is 414720, while the sum is 47.

The square root of 19664885 is about 4434.5106832660. The cubic root of 19664885 is about 269.9171442151.

The spelling of 19664885 in words is "nineteen million, six hundred sixty-four thousand, eight hundred eighty-five".