20845668 has 24 divisors (see below), whose sum is σ = 48720672. Its totient is φ = 6937024.

The previous prime is 20845639. The next prime is 20845673. The reversal of 20845668 is 86654802.

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 7 ways as a sum of consecutive naturals, for example, 9271 + ... + 11297.

It is an arithmetic number, because the mean of its divisors is an integer number (2030028).

Almost surely, 2^20845668 is an apocalyptic number.

It is an amenable number.

20845668 is an abundant number, since it is smaller than the sum of its proper divisors (27875004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20845668 is a wasteful number, since it uses less digits than its factorization.

20845668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2891 (or 2889 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 20845668 is about 4565.7056409716. The cubic root of 20845668 is about 275.2148975902.

The spelling of 20845668 in words is "twenty million, eight hundred forty-five thousand, six hundred sixty-eight".