20566241 has 2 divisors, whose sum is σ = 20566242. Its totient is φ = 20566240.

The previous prime is 20566193. The next prime is 20566267. The reversal of 20566241 is 14266502.

It is an a-pointer prime, because the next prime (20566267) can be obtained adding 20566241 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20566225 + 16 = 4535^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 20566241 - 2⁶ = 20566177 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20566241.

It is not a weakly prime, because it can be changed into another prime (20566541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10283120 + 10283121.

It is an arithmetic number, because the mean of its divisors is an integer number (10283121).

Almost surely, 2^20566241 is an apocalyptic number.

It is an amenable number.

20566241 is a deficient number, since it is larger than the sum of its proper divisors (1).

20566241 is an equidigital number, since it uses as much as digits as its factorization.

20566241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20566241 is about 4535.0017640570. The cubic root of 20566241 is about 273.9796502194.

The spelling of 20566241 in words is "twenty million, five hundred sixty-six thousand, two hundred forty-one".