20090173 has 2 divisors, whose sum is σ = 20090174. Its totient is φ = 20090172.

The previous prime is 20090143. The next prime is 20090183. The reversal of 20090173 is 37109002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20088324 + 1849 = 4482^2 + 43^2 .

It is a cyclic number.

It is not a de Polignac number, because 20090173 - 2⁹ = 20089661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20090143) 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, 10045086 + 10045087.

It is an arithmetic number, because the mean of its divisors is an integer number (10045087).

Almost surely, 2^20090173 is an apocalyptic number.

It is an amenable number.

20090173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20090173 is an equidigital number, since it uses as much as digits as its factorization.

20090173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 20090173 is about 4482.2062647763. The cubic root of 20090173 is about 271.8490953959.

Adding to 20090173 its reverse (37109002), we get a palindrome (57199175).

The spelling of 20090173 in words is "twenty million, ninety thousand, one hundred seventy-three".