The prime factors of 520 are 2, 2, 2, 5, and 13. This can be determined by breaking down 520 into its prime factors, which are the numbers that can only be divided evenly by 1 and themselves. In this case, 520 can be divided by 2, resulting in 260. 260 can then be divided by 2 again, resulting in 130. 130 can be divided by 2 once more, resulting in 65. Finally, 65 can be divided by 5 and 13. Therefore, the prime factors of 520 are 2, 2, 2, 5, and 13.