20318731892 has 24 divisors (see below), whose sum is σ = 36556214016. Its totient is φ = 9874662048.

The previous prime is 20318731877. The next prime is 20318731903. The reversal of 20318731892 is 29813781302.

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, 75653 + ... + 215315.

It is an arithmetic number, because the mean of its divisors is an integer number (1523175584).

Almost surely, 2^20318731892 is an apocalyptic number.

It is an amenable number.

20318731892 is a deficient number, since it is larger than the sum of its proper divisors (16237482124).

20318731892 is a wasteful number, since it uses less digits than its factorization.

20318731892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140687 (or 140685 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 20318731892 in words is "twenty billion, three hundred eighteen million, seven hundred thirty-one thousand, eight hundred ninety-two".