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No - the nearest big number divisible by 3 is 600 - which is 20 more than 580 As 20 is not divisible by 3 then also 580 is not.
To determine if a number is divisible by 3, add all the digits. If the sum is divisible by 3, so is the number. 8+4+3+5 = 20, which is not divisible by 3 (not a multiple of 3). So, 8435 is not divisible by 3.
To test whether a number is divisible by 3, the sum of its digits must also be divisible by 3. In this instance, the sum of the digits of 8264 is equal to 20. Therefore, since 20 is not divisible by 3, nor is 8264.
There is only one number that can be divisible by both 3 and 4 yet not greater than 20, 12.
15 is divisible by 3 and 5, because 15/3=5, and 15/5=3.