20065909 has 2 divisors, whose sum is σ = 20065910. Its totient is φ = 20065908.

The previous prime is 20065849. The next prime is 20065931. The reversal of 20065909 is 90956002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15563025 + 4502884 = 3945^2 + 2122^2 .

It is a cyclic number.

It is not a de Polignac number, because 20065909 - 2⁷ = 20065781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20065939) 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, 10032954 + 10032955.

It is an arithmetic number, because the mean of its divisors is an integer number (10032955).

Almost surely, 2^20065909 is an apocalyptic number.

It is an amenable number.

20065909 is a deficient number, since it is larger than the sum of its proper divisors (1).

20065909 is an equidigital number, since it uses as much as digits as its factorization.

20065909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 20065909 is about 4479.4987442793. The cubic root of 20065909 is about 271.7396089695.

The spelling of 20065909 in words is "twenty million, sixty-five thousand, nine hundred nine".