20159995878 has 48 divisors (see below), whose sum is σ = 49415760576. Its totient is φ = 6109088040.

The previous prime is 20159995837. The next prime is 20159995913. The reversal of 20159995878 is 87859995102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1880176 + ... + 1890867.

It is an arithmetic number, because the mean of its divisors is an integer number (1029495012).

Almost surely, 2^20159995878 is an apocalyptic number.

20159995878 is an abundant number, since it is smaller than the sum of its proper divisors (29255764698).

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

20159995878 is a wasteful number, since it uses less digits than its factorization.

20159995878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3771071 (or 3771059 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 63.

The spelling of 20159995878 in words is "twenty billion, one hundred fifty-nine million, nine hundred ninety-five thousand, eight hundred seventy-eight".