20078972564 has 12 divisors (see below), whose sum is σ = 40157945184. Its totient is φ = 8605273944.

The previous prime is 20078972509. The next prime is 20078972569. The reversal of 20078972564 is 46527987002.

20078972564 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20078972569) 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 3 ways as a sum of consecutive naturals, for example, 358553054 + ... + 358553109.

It is an arithmetic number, because the mean of its divisors is an integer number (3346495432).

Almost surely, 2^20078972564 is an apocalyptic number.

It is an amenable number.

20078972564 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20078972564 is a wasteful number, since it uses less digits than its factorization.

20078972564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717106174 (or 717106172 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 20078972564 in words is "twenty billion, seventy-eight million, nine hundred seventy-two thousand, five hundred sixty-four".