16
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The smallest positive number that is divisible by all numbers 1-15 is 360,360. Any multiple of that number (like 720,720 or 1,081,080) will also be divisible by all numbers 1-15.
No. Is is divisible by 1, 5, 23, and itself. A prime number is divisible by only 1 and itself.
117
If the last three digits of a number are divisible by 8, the whole number is divisible by 8.
1, 2, 5, 10, 23, 46, 115, 230
The factors of 115 are: 1, 5, 23, 115