20868889920 has 448 divisors, whose sum is σ = 74658931200. Its totient is φ = 4910743552.

The previous prime is 20868889841. The next prime is 20868889931. The reversal of 20868889920 is 2998886802.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19893556 + ... + 19894604.

It is an arithmetic number, because the mean of its divisors is an integer number (166649400).

Almost surely, 2^20868889920 is an apocalyptic number.

20868889920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20868889920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37329465600).

20868889920 is an abundant number, since it is smaller than the sum of its proper divisors (53790041280).

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

20868889920 is a wasteful number, since it uses less digits than its factorization.

20868889920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162 (or 1152 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 60.

The spelling of 20868889920 in words is "twenty billion, eight hundred sixty-eight million, eight hundred eighty-nine thousand, nine hundred twenty".