A number such as 6 has 4 factors, shown in pairs on the legs of this factor spider.
1 x 6 and 2 x 3 both equal 6.
The number 12 has 6 factors, shown on the legs of this factor spider.
Look at the factor spider for the number 9, which has 3 factors. Note that the factor 3 should only be counted once.
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