19801164 has 12 divisors (see below), whose sum is σ = 46202744. Its totient is φ = 6600384.

The previous prime is 19801163. The next prime is 19801181. The reversal of 19801164 is 46110891.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (19801163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 825037 + ... + 825060.

Almost surely, 2^19801164 is an apocalyptic number.

It is an amenable number.

19801164 is an abundant number, since it is smaller than the sum of its proper divisors (26401580).

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

19801164 is a wasteful number, since it uses less digits than its factorization.

19801164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650104 (or 1650102 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 19801164 is about 4449.8498851085. The cubic root of 19801164 is about 270.5392241675.

The spelling of 19801164 in words is "nineteen million, eight hundred one thousand, one hundred sixty-four".