All 16 of these: 1 2 3 6 9 18 23 27 46 54 69 138 207 414 621 1242.
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To find the average of a set of numbers, you add up all the numbers and then divide by the total count of numbers. In this case, the sum of 1242, 87, 512, and 169810 is 171651. Since there are 4 numbers in the set, you divide the sum by 4 to get the average, which is 42912.75.
1, 2, 4, 5, 10, and 20 divide evenly into 20.
1 and 13
5 & 17
1 2 7 14 49 and 98 all divide into 98 evenly.