Excited Kashyap !!!

Kashyap is very excited today. Because he is going to get the phone number of his dream girl Riya. But there is a twist, Riya has $N$ numbers, she asked Kashyap to choose a number. If the total count of divisors of that number will be $odd$ then she will give him the correct contact number otherwise wrong number. You are a friend of Kashyap, So you want to help him by telling him all such numbers