19807164 has 36 divisors (see below), whose sum is σ = 53920776. Its totient is φ = 6094368.

The previous prime is 19807121. The next prime is 19807187. The reversal of 19807164 is 46170891.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20694 + ... + 21629.

Almost surely, 2^19807164 is an apocalyptic number.

It is an amenable number.

19807164 is an abundant number, since it is smaller than the sum of its proper divisors (34113612).

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

19807164 is a wasteful number, since it uses less digits than its factorization.

19807164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42346 (or 42341 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 19807164 is about 4450.5240140909. The cubic root of 19807164 is about 270.5665469959.

It can be divided in two parts, 198071 and 64, that added together give a triangular number (198135 = T₆₂₉).

The spelling of 19807164 in words is "nineteen million, eight hundred seven thousand, one hundred sixty-four".