20566228 has 24 divisors (see below), whose sum is σ = 37452800. Its totient is φ = 9872928.

The previous prime is 20566193. The next prime is 20566241. The reversal of 20566228 is 82266502.

It is a self number, because there is not a number n which added to its sum of digits gives 20566228.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10813 + ... + 12571.

Almost surely, 2^20566228 is an apocalyptic number.

It is an amenable number.

20566228 is a deficient number, since it is larger than the sum of its proper divisors (16886572).

20566228 is a wasteful number, since it uses less digits than its factorization.

20566228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879 (or 1877 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 20566228 is about 4535.0003307607. Note that the first 3 decimals coincide. The cubic root of 20566228 is about 273.9795924915.

The spelling of 20566228 in words is "twenty million, five hundred sixty-six thousand, two hundred twenty-eight".