20209169 has 2 divisors, whose sum is σ = 20209170. Its totient is φ = 20209168.

The previous prime is 20209153. The next prime is 20209199. The reversal of 20209169 is 96190202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10368400 + 9840769 = 3220^2 + 3137^2 .

It is a cyclic number.

It is not a de Polignac number, because 20209169 - 2⁴ = 20209153 is a prime.

It is a super-2 number, since 2×20209169² = 816821023341122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20209109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10104584 + 10104585.

It is an arithmetic number, because the mean of its divisors is an integer number (10104585).

Almost surely, 2^20209169 is an apocalyptic number.

It is an amenable number.

20209169 is a deficient number, since it is larger than the sum of its proper divisors (1).

20209169 is an equidigital number, since it uses as much as digits as its factorization.

20209169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 20209169 is about 4495.4609329856. The cubic root of 20209169 is about 272.3847684943.

The spelling of 20209169 in words is "twenty million, two hundred nine thousand, one hundred sixty-nine".