20566229 has 4 divisors (see below), whose sum is σ = 20755020. Its totient is φ = 20377440.

The previous prime is 20566193. The next prime is 20566241. The reversal of 20566229 is 92266502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14326225 + 6240004 = 3785^2 + 2498^2 .

It is a cyclic number.

It is not a de Polignac number, because 20566229 - 2²⁰ = 19517653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20566195 and 20566204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20566129) 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 3 ways as a sum of consecutive naturals, for example, 94232 + ... + 94449.

It is an arithmetic number, because the mean of its divisors is an integer number (5188755).

Almost surely, 2^20566229 is an apocalyptic number.

It is an amenable number.

20566229 is a deficient number, since it is larger than the sum of its proper divisors (188791).

20566229 is a wasteful number, since it uses less digits than its factorization.

20566229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188790.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 20566229 is about 4535.0004410143. Note that the first 3 decimals coincide. The cubic root of 20566229 is about 273.9795969321.

The spelling of 20566229 in words is "twenty million, five hundred sixty-six thousand, two hundred twenty-nine".