20553668 has 12 divisors (see below), whose sum is σ = 37862160. Its totient is φ = 9735912.

The previous prime is 20553647. The next prime is 20553691. The reversal of 20553668 is 86635502.

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, 135146 + ... + 135297.

It is an arithmetic number, because the mean of its divisors is an integer number (3155180).

Almost surely, 2^20553668 is an apocalyptic number.

It is an amenable number.

20553668 is a deficient number, since it is larger than the sum of its proper divisors (17308492).

20553668 is a wasteful number, since it uses less digits than its factorization.

20553668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270466 (or 270464 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 20553668 is about 4533.6153343662. The cubic root of 20553668 is about 273.9238071130.

The spelling of 20553668 in words is "twenty million, five hundred fifty-three thousand, six hundred sixty-eight".