20188164 has 24 divisors (see below), whose sum is σ = 47281248. Its totient is φ = 6704320.

The previous prime is 20188151. The next prime is 20188169. The reversal of 20188164 is 46188102.

It is not an unprimeable number, because it can be changed into a prime (20188169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379 + ... + 6365.

It is an arithmetic number, because the mean of its divisors is an integer number (1970052).

Almost surely, 2^20188164 is an apocalyptic number.

It is an amenable number.

20188164 is an abundant number, since it is smaller than the sum of its proper divisors (27093084).

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

20188164 is a wasteful number, since it uses less digits than its factorization.

20188164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6275 (or 6273 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 20188164 is about 4493.1240801919. The cubic root of 20188164 is about 272.2903653803.

The spelling of 20188164 in words is "twenty million, one hundred eighty-eight thousand, one hundred sixty-four".