20042173 has 2 divisors, whose sum is σ = 20042174. Its totient is φ = 20042172.

The previous prime is 20042117. The next prime is 20042249. The reversal of 20042173 is 37124002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17614809 + 2427364 = 4197^2 + 1558^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20042173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20042173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20042273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10021086 + 10021087.

It is an arithmetic number, because the mean of its divisors is an integer number (10021087).

Almost surely, 2^20042173 is an apocalyptic number.

It is an amenable number.

20042173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20042173 is an equidigital number, since it uses as much as digits as its factorization.

20042173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20042173 is about 4476.8485567417. The cubic root of 20042173 is about 271.6324196022.

Adding to 20042173 its reverse (37124002), we get a palindrome (57166175).

The spelling of 20042173 in words is "twenty million, forty-two thousand, one hundred seventy-three".