20978073688 has 64 divisors (see below), whose sum is σ = 46243249920. Its totient is φ = 8795740800.

The previous prime is 20978073673. The next prime is 20978073707. The reversal of 20978073688 is 88637087902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1832703 + ... + 1844113.

It is an arithmetic number, because the mean of its divisors is an integer number (722550780).

Almost surely, 2^20978073688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20978073688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23121624960).

20978073688 is an abundant number, since it is smaller than the sum of its proper divisors (25265176232).

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

20978073688 is a wasteful number, since it uses less digits than its factorization.

20978073688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13048 (or 13044 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 58.

The spelling of 20978073688 in words is "twenty billion, nine hundred seventy-eight million, seventy-three thousand, six hundred eighty-eight".