20668684 has 12 divisors (see below), whose sum is σ = 36414000. Its totient is φ = 10264688.

The previous prime is 20668667. The next prime is 20668693. The reversal of 20668684 is 48686602.

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, 16744 + ... + 17935.

It is an arithmetic number, because the mean of its divisors is an integer number (3034500).

Almost surely, 2^20668684 is an apocalyptic number.

It is an amenable number.

20668684 is a deficient number, since it is larger than the sum of its proper divisors (15745316).

20668684 is a wasteful number, since it uses less digits than its factorization.

20668684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34832 (or 34830 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 20668684 is about 4546.2824373327. The cubic root of 20668684 is about 274.4338058688.

The spelling of 20668684 in words is "twenty million, six hundred sixty-eight thousand, six hundred eighty-four".