20388340185 has 16 divisors (see below), whose sum is σ = 33156121920. Its totient is φ = 10695522240.

The previous prime is 20388340153. The next prime is 20388340213. The reversal of 20388340185 is 58104388302.

It is not a de Polignac number, because 20388340185 - 2⁵ = 20388340153 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11140255 + ... + 11142084.

It is an arithmetic number, because the mean of its divisors is an integer number (2072257620).

Almost surely, 2^20388340185 is an apocalyptic number.

It is an amenable number.

20388340185 is a deficient number, since it is larger than the sum of its proper divisors (12767781735).

20388340185 is a wasteful number, since it uses less digits than its factorization.

20388340185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22282408.

The product of its (nonzero) digits is 184320, while the sum is 42.

The spelling of 20388340185 in words is "twenty billion, three hundred eighty-eight million, three hundred forty thousand, one hundred eighty-five".