20990168 has 16 divisors (see below), whose sum is σ = 41068080. Its totient is φ = 10038688.

The previous prime is 20990143. The next prime is 20990183. The reversal of 20990168 is 86109902.

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, 56855 + ... + 57222.

It is an arithmetic number, because the mean of its divisors is an integer number (2566755).

Almost surely, 2^20990168 is an apocalyptic number.

It is an amenable number.

20990168 is a deficient number, since it is larger than the sum of its proper divisors (20077912).

20990168 is a wasteful number, since it uses less digits than its factorization.

20990168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114106 (or 114102 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 20990168 is about 4581.5028102141. The cubic root of 20990168 is about 275.8493541826.

The spelling of 20990168 in words is "twenty million, nine hundred ninety thousand, one hundred sixty-eight".