19864164 has 24 divisors (see below), whose sum is σ = 46428480. Its totient is φ = 6610144.

The previous prime is 19864129. The next prime is 19864181. The reversal of 19864164 is 46146891.

It is a super-2 number, since 2×19864164² = 789170022837792, which contains 22 as substring.

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, 9082 + ... + 11054.

It is an arithmetic number, because the mean of its divisors is an integer number (1934520).

Almost surely, 2^19864164 is an apocalyptic number.

It is an amenable number.

19864164 is an abundant number, since it is smaller than the sum of its proper divisors (26564316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19864164 is a wasteful number, since it uses less digits than its factorization.

19864164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2819 (or 2817 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 19864164 is about 4456.9231539258. The cubic root of 19864164 is about 270.8258390878.

The spelling of 19864164 in words is "nineteen million, eight hundred sixty-four thousand, one hundred sixty-four".