693 is evenly divisible by 3. You can tell that at a glance because every one of its digits is evenly divisible by 3.
Any of its factors
no numbers!
Nothing can go evenly into 21 or 17. They are both odd numbers and therefore cannot be evenly divided.
693 693 / 3 = 231 693 / 7 = 99 693 / 9 = 77 693 / 11 = 63
The numbers that go into 30 are1, 2, 3, 5, 30, 15, 10, 6
60.5
1,2,3,6,7
11,6,1,2,33
n
2,4,7
1,2,4,8,16,32