What is prime factor of 17820?

Answer 1

Why don't you start looking for obvious factors. Since the number ends with 0, you can separate a factor of 10, which is equal to 2 x 5. Thus, you get:

17820 = 2 x 5 x 1782.

Next, since the last digit is an even number, you can continue dividing by 2, to get:

2 x 5 x 2 x 891

Next, you might try other small factors, such as 3, 5, or 7.

Answer 2

2, 3, 5 and 11