Only 1 and 19 because 19 is a Prime number.
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There are no other whole numbers besides ' 1 ' and 19 that go into 19 evenly. That makes 19 a prime number.
3, 19, 57, 59, 177, and 1121 go in evenly. 3363 / 3 = 1121 3363 / 19 = 177 3363 / 57 = 59 3363 / 59 = 57 3363 / 177 = 19 3363 / 1121 = 3
1 and 19
Nothing can go evenly into 21 or 17. They are both odd numbers and therefore cannot be evenly divided.
1 13 19 247.