1, 2, 4, 5, 8
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One through nine all have single digit factors.
The factors of 4 are: 1, 2, and 4.The only prime factor of 4 is: 2.The factors of 40 are: 1, 2, 4, 5, 8, 10, 20, and 40.The prime factors of 40 are: 2 and 5.
0.
Both 10 and 20 are two-digit numbers that are factors of 20.
40 has 8 factors: 1 2 4 5 8 10 20 40.