20189404 has 24 divisors (see below), whose sum is σ = 37558080. Its totient is φ = 9463296.

The previous prime is 20189399. The next prime is 20189431. The reversal of 20189404 is 40498102.

It is a super-2 number, since 2×20189404² = 815224067750432, which contains 22 as substring.

It is a congruent number.

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, 24552 + ... + 25360.

It is an arithmetic number, because the mean of its divisors is an integer number (1564920).

Almost surely, 2^20189404 is an apocalyptic number.

It is an amenable number.

20189404 is a deficient number, since it is larger than the sum of its proper divisors (17368676).

20189404 is a wasteful number, since it uses less digits than its factorization.

20189404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197 (or 1195 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20189404 is about 4493.2620666950. The cubic root of 20189404 is about 272.2959401507.

The spelling of 20189404 in words is "twenty million, one hundred eighty-nine thousand, four hundred four".