20390018704 has 20 divisors (see below), whose sum is σ = 43097085360. Its totient is φ = 9268190240.

The previous prime is 20390018699. The next prime is 20390018723. The reversal of 20390018704 is 40781009302.

It is a self number, because there is not a number n which added to its sum of digits gives 20390018704.

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, 57926014 + ... + 57926365.

It is an arithmetic number, because the mean of its divisors is an integer number (2154854268).

Almost surely, 2^20390018704 is an apocalyptic number.

It is an amenable number.

20390018704 is an abundant number, since it is smaller than the sum of its proper divisors (22707066656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20390018704 is a wasteful number, since it uses less digits than its factorization.

20390018704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115852398 (or 115852392 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The spelling of 20390018704 in words is "twenty billion, three hundred ninety million, eighteen thousand, seven hundred four".