20516668 has 12 divisors (see below), whose sum is σ = 37062592. Its totient is φ = 9927360.

The previous prime is 20516609. The next prime is 20516681. The reversal of 20516668 is 86661502.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82605 + ... + 82852.

Almost surely, 2^20516668 is an apocalyptic number.

It is an amenable number.

20516668 is a deficient number, since it is larger than the sum of its proper divisors (16545924).

20516668 is a wasteful number, since it uses less digits than its factorization.

20516668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165492 (or 165490 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 20516668 is about 4529.5328677470. The cubic root of 20516668 is about 273.7593390057.

The spelling of 20516668 in words is "twenty million, five hundred sixteen thousand, six hundred sixty-eight".