20390307680 has 48 divisors (see below), whose sum is σ = 48198556224. Its totient is φ = 8151644160.

The previous prime is 20390307667. The next prime is 20390307701. The reversal of 20390307680 is 8670309302.

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, 265304 + ... + 333416.

It is an arithmetic number, because the mean of its divisors is an integer number (1004136588).

Almost surely, 2^20390307680 is an apocalyptic number.

20390307680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20390307680 is an abundant number, since it is smaller than the sum of its proper divisors (27808248544).

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

20390307680 is a wasteful number, since it uses less digits than its factorization.

20390307680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69999 (or 69991 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 38.

The spelling of 20390307680 in words is "twenty billion, three hundred ninety million, three hundred seven thousand, six hundred eighty".