20707878904 has 32 divisors (see below), whose sum is σ = 39592556640. Its totient is φ = 10151856000.

The previous prime is 20707878901. The next prime is 20707878929. The reversal of 20707878904 is 40987870702.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20707878901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41187 + ... + 207634.

It is an arithmetic number, because the mean of its divisors is an integer number (1237267395).

Almost surely, 2^20707878904 is an apocalyptic number.

It is an amenable number.

20707878904 is a deficient number, since it is larger than the sum of its proper divisors (18884677736).

20707878904 is a wasteful number, since it uses less digits than its factorization.

20707878904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249031 (or 249027 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 52.

The spelling of 20707878904 in words is "twenty billion, seven hundred seven million, eight hundred seventy-eight thousand, nine hundred four".