They are itself and one because 23 is a Prime number
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These are all the whole numbers that go into 1,265 evenly: 1, 5, 11, 23, 55, 115, 253, 1265.
Nothing can go evenly into 21 or 17. They are both odd numbers and therefore cannot be evenly divided.
No. 23 is not evenly divisible by four.
1,2,4,8,16,32
255