20787878874 has 24 divisors (see below), whose sum is σ = 48363637248. Its totient is φ = 5939393880.

The previous prime is 20787878869. The next prime is 20787878899. The reversal of 20787878874 is 47887878702.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35353242 + ... + 35353829.

It is an arithmetic number, because the mean of its divisors is an integer number (2015151552).

Almost surely, 2^20787878874 is an apocalyptic number.

20787878874 is an abundant number, since it is smaller than the sum of its proper divisors (27575758374).

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

20787878874 is a wasteful number, since it uses less digits than its factorization.

20787878874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70707090 (or 70707083 counting only the distinct ones).

The product of its (nonzero) digits is 78675968, while the sum is 66.

The spelling of 20787878874 in words is "twenty billion, seven hundred eighty-seven million, eight hundred seventy-eight thousand, eight hundred seventy-four".