518 is only divisible by 2
If sum of digits of a number is divisible by 3 then the number is divisible by 3. Sum of digits = 5+1+8 = 14 and 14 is not divisible by 3. So 518 is not divisible by 3.
No - a number cannot be smaller than its divisor.
The multiples of 74 (which are infinite) are all divisible by 74, including these: 74, 148, 222, 296, 370, 444, 518, 592, 666 . . .
9,842 is divisible by: 1, 2, 7, 14, 19, 37, 38, 74, 133, 259, 266, 518, 703, 1406, 4921 and 9842.
1, 2, 7, 14, 37, 74, 259, 518, 12476459, 24952918, 87335213, 174670426, 461628983, 923257966, 3231402881, 6462805762
518
518 = 51,800%
The factors of 518 are: 1 2 7 14 37 74 259 518
518 x 7 = 3626
20% of 518 = 103.6
518+475 = 993
They are 37*7*2 = 518