20565066 has 8 divisors (see below), whose sum is σ = 41130144. Its totient is φ = 6855020.

The previous prime is 20565001. The next prime is 20565073. The reversal of 20565066 is 66056502.

It is a sphenic number, since it is the product of 3 distinct primes.

20565066 is an admirable number.

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, 1713750 + ... + 1713761.

It is an arithmetic number, because the mean of its divisors is an integer number (5141268).

Almost surely, 2^20565066 is an apocalyptic number.

20565066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20565066 is a wasteful number, since it uses less digits than its factorization.

20565066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3427516.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 20565066 is about 4534.8722142967. The cubic root of 20565066 is about 273.9744324093.

The spelling of 20565066 in words is "twenty million, five hundred sixty-five thousand, sixty-six".