20002978864 has 40 divisors (see below), whose sum is σ = 42287753232. Its totient is φ = 9090385920.

The previous prime is 20002978837. The next prime is 20002978871. The reversal of 20002978864 is 46887920002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1194292 + ... + 1210924.

Almost surely, 2^20002978864 is an apocalyptic number.

It is an amenable number.

20002978864 is an abundant number, since it is smaller than the sum of its proper divisors (22284774368).

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

20002978864 is a wasteful number, since it uses less digits than its factorization.

20002978864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23485 (or 23479 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 20002978864 in words is "twenty billion, two million, nine hundred seventy-eight thousand, eight hundred sixty-four".