20388742185 has 32 divisors (see below), whose sum is σ = 38149309440. Its totient is φ = 9103808448.

The previous prime is 20388742177. The next prime is 20388742207. The reversal of 20388742185 is 58124788302.

It is not a de Polignac number, because 20388742185 - 2³ = 20388742177 is a prime.

It is a super-3 number, since 3×20388742185³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2253375 + ... + 2262404.

It is an arithmetic number, because the mean of its divisors is an integer number (1192165920).

Almost surely, 2^20388742185 is an apocalyptic number.

It is an amenable number.

20388742185 is a deficient number, since it is larger than the sum of its proper divisors (17760567255).

20388742185 is a wasteful number, since it uses less digits than its factorization.

20388742185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4515837.

The product of its (nonzero) digits is 860160, while the sum is 48.

The spelling of 20388742185 in words is "twenty billion, three hundred eighty-eight million, seven hundred forty-two thousand, one hundred eighty-five".