20866201 has 2 divisors, whose sum is σ = 20866202. Its totient is φ = 20866200.

The previous prime is 20866189. The next prime is 20866207. The reversal of 20866201 is 10266802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13838400 + 7027801 = 3720^2 + 2651^2 .

It is a cyclic number.

It is not a de Polignac number, because 20866201 - 2⁵ = 20866169 is a prime.

It is not a weakly prime, because it can be changed into another prime (20866207) 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 as a sum of consecutive naturals, namely, 10433100 + 10433101.

It is an arithmetic number, because the mean of its divisors is an integer number (10433101).

Almost surely, 2^20866201 is an apocalyptic number.

It is an amenable number.

20866201 is a deficient number, since it is larger than the sum of its proper divisors (1).

20866201 is an equidigital number, since it uses as much as digits as its factorization.

20866201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20866201 is about 4567.9536994151. The cubic root of 20866201 is about 275.3052302370.

The spelling of 20866201 in words is "twenty million, eight hundred sixty-six thousand, two hundred one".