how do you find this one?

Factors for 2001 are 1, 3, 23, 29, 69, 87, 667 and 2001

Factors for 6837 which has any of the above is only 3, so GCD is 3.

how do you find this one?

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Factors for 2001 are 1, 3, 23, 29, 69, 87, 667 and 2001

Factors for 6837 which has any of the above is only 3, so GCD is 3.

6837 = 1*3*43*53

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GCD

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If sum of all digits in the number is divisible by 3 or 9 that whole number is dividable by 3 or 9:

2+0+0+1=3

6+8+3+7=24

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thank you!