20718768 has 120 divisors (see below), whose sum is σ = 65138688. Its totient is φ = 5647488.

The previous prime is 20718751. The next prime is 20718781. The reversal of 20718768 is 86781702.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53905 + ... + 54287.

Almost surely, 2^20718768 is an apocalyptic number.

20718768 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 20718768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32569344).

20718768 is an abundant number, since it is smaller than the sum of its proper divisors (44419920).

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

20718768 is a wasteful number, since it uses less digits than its factorization.

20718768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 20718768 is about 4551.7873412540. The cubic root of 20718768 is about 274.6552948235.

The spelling of 20718768 in words is "twenty million, seven hundred eighteen thousand, seven hundred sixty-eight".