20918072448 has 320 divisors, whose sum is σ = 76621110720. Its totient is φ = 5516605440.

The previous prime is 20918072423. The next prime is 20918072491. The reversal of 20918072448 is 84427081902.

20918072448 is a `hidden beast` number, since 20 + 9 + 180 + 7 + 2 + 448 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 932403 + ... + 954573.

It is an arithmetic number, because the mean of its divisors is an integer number (239440971).

Almost surely, 2^20918072448 is an apocalyptic number.

20918072448 is a gapful number since it is divisible by the number (28) 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 20918072448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38310555360).

20918072448 is an abundant number, since it is smaller than the sum of its proper divisors (55703038272).

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

20918072448 is a wasteful number, since it uses less digits than its factorization.

20918072448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22217 (or 22196 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 20918072448 in words is "twenty billion, nine hundred eighteen million, seventy-two thousand, four hundred forty-eight".