20304173 has 2 divisors, whose sum is σ = 20304174. Its totient is φ = 20304172.

The previous prime is 20304161. The next prime is 20304181. The reversal of 20304173 is 37140302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19386409 + 917764 = 4403^2 + 958^2 .

It is a cyclic number.

It is not a de Polignac number, because 20304173 - 2¹⁰ = 20303149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20304773) 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, 10152086 + 10152087.

It is an arithmetic number, because the mean of its divisors is an integer number (10152087).

Almost surely, 2^20304173 is an apocalyptic number.

It is an amenable number.

20304173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20304173 is an equidigital number, since it uses as much as digits as its factorization.

20304173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 20304173 is about 4506.0152019273. The cubic root of 20304173 is about 272.8109314497.

Adding to 20304173 its reverse (37140302), we get a palindrome (57444475).

The spelling of 20304173 in words is "twenty million, three hundred four thousand, one hundred seventy-three".