20388908 has 6 divisors (see below), whose sum is σ = 35680596. Its totient is φ = 10194452.

The previous prime is 20388883. The next prime is 20388947. The reversal of 20388908 is 80988302.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2548610 + ... + 2548617.

It is an arithmetic number, because the mean of its divisors is an integer number (5946766).

Almost surely, 2^20388908 is an apocalyptic number.

It is an amenable number.

20388908 is a deficient number, since it is larger than the sum of its proper divisors (15291688).

20388908 is a wasteful number, since it uses less digits than its factorization.

20388908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5097231 (or 5097229 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 20388908 is about 4515.4078442595. The cubic root of 20388908 is about 273.1899102148.

The spelling of 20388908 in words is "twenty million, three hundred eighty-eight thousand, nine hundred eight".