So you guys want to know where I was born II

You had a little problem there with one of the countries from the previous clue, but finally managed to get all the flags right. Let's see what you make of the next clue.

In this one, you're going to work a little bit of math. The next clue is coded and I've used a simple substitution cipher, based on a number (called the key), to write it.

To help you understand what this means, here is an example: suppose you know the key to your cipher is 4, then you would substitute the letter A by the fourth letter in the alphabet, D, the letter B by the fifth letter, E, the C by the sixth letter, F, and so on and so forth. So, instead of, for example, HELLO, you would write KHOOR.

Now, for the actual clue:

GUR PBHAGEL JURER V JNF OBEA VF N ERCHOYVP

And you will need to find the key to the cipher. In order to do that: multiple the amount of divisors the number 120 has by the tenth smallest prime number, now add the digits of the result and use that as your key.

When you've decoded the message, write a comment with the countries left out of the ones in the previous clue.

Good luck!

ETA: Now, guys, I'm expecting you to solve this on your own, you don't need anybody's help, you'll see :).