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Q: What number has exactly 5 factors and is between 1and 20?

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16

a prime number

Because the prime numbers between 1and 50 only have exactly 2 unique factors.

Yes

What number between 1and 10 can go into 1001

There are five of them, including the number 1.

1 1 and 3

Factors.

Only common is one only

56 + 56 + 28 + 8 + 2 + 1 = 151

There are exactly 5,761,455 prime numbers below 100,000,000, the first being two, and the last 99,999,989.

15 and 30 have those factors.

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