20989168 has 20 divisors (see below), whose sum is σ = 40879080. Its totient is φ = 10439744.

The previous prime is 20989153. The next prime is 20989187. The reversal of 20989168 is 86198902.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178 + ... + 6481.

It is an arithmetic number, because the mean of its divisors is an integer number (2043954).

Almost surely, 2^20989168 is an apocalyptic number.

It is an amenable number.

20989168 is a deficient number, since it is larger than the sum of its proper divisors (19889912).

20989168 is a wasteful number, since it uses less digits than its factorization.

20989168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6864 (or 6858 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 20989168 is about 4581.3936744183. The cubic root of 20989168 is about 275.8449735009.

The spelling of 20989168 in words is "twenty million, nine hundred eighty-nine thousand, one hundred sixty-eight".