20173 has 2 divisors, whose sum is σ = 20174. Its totient is φ = 20172.

The previous prime is 20161. The next prime is 20177. The reversal of 20173 is 37102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20164 + 9 = 142^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 20173 - 2⁹ = 19661 is a prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10086 + 10087.

It is an arithmetic number, because the mean of its divisors is an integer number (10087).

2²⁰¹⁷³ is an apocalyptic number.

It is an amenable number.

20173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20173 is an equidigital number, since it uses as much as digits as its factorization.

20173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42, while the sum is 13.

The square root of 20173 is about 142.0316866055. The cubic root of 20173 is about 27.2222172860. Note that the first 4 decimals are identical.

Adding to 20173 its reverse (37102), we get a palindrome (57275).

The spelling of 20173 in words is "twenty thousand, one hundred seventy-three", and thus it is an iban number.