20566230 has 16 divisors (see below), whose sum is σ = 49359024. Its totient is φ = 5484320.

The previous prime is 20566193. The next prime is 20566241. The reversal of 20566230 is 3266502.

20566230 = 2266² + 2267² + ... + 2269².

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20566230.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342741 + ... + 342800.

It is an arithmetic number, because the mean of its divisors is an integer number (3084939).

Almost surely, 2^20566230 is an apocalyptic number.

20566230 is an abundant number, since it is smaller than the sum of its proper divisors (28792794).

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

20566230 is a wasteful number, since it uses less digits than its factorization.

20566230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685551.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20566230 is about 4535.0005512679. Note that the first 3 decimals coincide. The cubic root of 20566230 is about 273.9796013727.

The spelling of 20566230 in words is "twenty million, five hundred sixty-six thousand, two hundred thirty".