20390668 has 12 divisors (see below), whose sum is σ = 36443232. Its totient is φ = 9978320.

The previous prime is 20390659. The next prime is 20390681. The reversal of 20390668 is 86609302.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54043 + ... + 54418.

It is an arithmetic number, because the mean of its divisors is an integer number (3036936).

Almost surely, 2^20390668 is an apocalyptic number.

It is an amenable number.

20390668 is a deficient number, since it is larger than the sum of its proper divisors (16052564).

20390668 is a wasteful number, since it uses less digits than its factorization.

20390668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108512 (or 108510 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 20390668 is about 4515.6027283188. The cubic root of 20390668 is about 273.1977707045.

The spelling of 20390668 in words is "twenty million, three hundred ninety thousand, six hundred sixty-eight".