20566233 has 12 divisors (see below), whose sum is σ = 29758768. Its totient is φ = 13686840.

The previous prime is 20566193. The next prime is 20566241. The reversal of 20566233 is 33266502.

It is not a de Polignac number, because 20566233 - 2⁸ = 20565977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20566197 and 20566206.

It is not an unprimeable number, because it can be changed into a prime (20516233) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 4566 + ... + 7872.

Almost surely, 2^20566233 is an apocalyptic number.

It is an amenable number.

20566233 is a deficient number, since it is larger than the sum of its proper divisors (9192535).

20566233 is a wasteful number, since it uses less digits than its factorization.

20566233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4004 (or 4001 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 20566233 is about 4535.0008820286. Note that the first 3 decimals coincide. The cubic root of 20566233 is about 273.9796146945.

The spelling of 20566233 in words is "twenty million, five hundred sixty-six thousand, two hundred thirty-three".