20565228 has 12 divisors (see below), whose sum is σ = 47985560. Its totient is φ = 6855072.

The previous prime is 20565211. The next prime is 20565247. The reversal of 20565228 is 82256502.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 20565195 and 20565204.

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, 856873 + ... + 856896.

Almost surely, 2^20565228 is an apocalyptic number.

It is an amenable number.

20565228 is an abundant number, since it is smaller than the sum of its proper divisors (27420332).

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

20565228 is a wasteful number, since it uses less digits than its factorization.

20565228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713776 (or 1713774 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 20565228 is about 4534.8900758453. The cubic root of 20565228 is about 273.9751518128.

The spelling of 20565228 in words is "twenty million, five hundred sixty-five thousand, two hundred twenty-eight".