20918095056 has 120 divisors (see below), whose sum is σ = 59795012160. Its totient is φ = 6824452608.

The previous prime is 20918095013. The next prime is 20918095063. The reversal of 20918095056 is 65059081902.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1974285 + ... + 1984851.

It is an arithmetic number, because the mean of its divisors is an integer number (498291768).

Almost surely, 2^20918095056 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 20918095056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29897506080).

20918095056 is an abundant number, since it is smaller than the sum of its proper divisors (38876917104).

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

20918095056 is a wasteful number, since it uses less digits than its factorization.

20918095056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10873 (or 10864 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 20918095056 in words is "twenty billion, nine hundred eighteen million, ninety-five thousand, fifty-six".