20187131908 has 12 divisors (see below), whose sum is σ = 35331385600. Its totient is φ = 10092450312.

The previous prime is 20187131879. The next prime is 20187131917. The reversal of 20187131908 is 80913178102.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237516 + ... + 311107.

Almost surely, 2^20187131908 is an apocalyptic number.

It is an amenable number.

20187131908 is a deficient number, since it is larger than the sum of its proper divisors (15144253692).

20187131908 is a wasteful number, since it uses less digits than its factorization.

20187131908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557826 (or 557824 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 40.

The spelling of 20187131908 in words is "twenty billion, one hundred eighty-seven million, one hundred thirty-one thousand, nine hundred eight".