22020209 has 2 divisors, whose sum is σ = 22020210. Its totient is φ = 22020208.

The previous prime is 22020203. The next prime is 22020211. The reversal of 22020209 is 90202022.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16483600 + 5536609 = 4060^2 + 2353^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22020209 is a prime.

It is a Sophie Germain prime.

Together with 22020211, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22020203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11010104 + 11010105.

It is an arithmetic number, because the mean of its divisors is an integer number (11010105).

Almost surely, 2^22020209 is an apocalyptic number.

It is an amenable number.

22020209 is a deficient number, since it is larger than the sum of its proper divisors (1).

22020209 is an equidigital number, since it uses as much as digits as its factorization.

22020209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 22020209 is about 4692.5695519619. The cubic root of 22020209 is about 280.2897044032.

The spelling of 22020209 in words is "twenty-two million, twenty thousand, two hundred nine".