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Q: What is the sum of all prime factors of 212?

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42 has three prime factors: 2, 3 and 7

The sum of the all prime numbers from 1 to 100 is 1,161

No, by inspection it is even (2 is one of the factors), also by sum of digits, 9 is one of the factors. Either of these is enough to show that it is not prime.

The only factors of a prime are 1 and itself. So, the only factor smaller than the number itself is 1. Therefore the sum of all factors smaller than the number is 1. But 1 is not a prime number. Thus, there is no prime number that is a perfect number.

65 and 77

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The sum of prime factors of 1,260 is: 17

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the prime factors of sum of 121 is 112 and 22

1 + 2 + 4 + 53 + 106 + 212 = 378

The prime factors of 28 are 2 and 7. Their sum is 9.

2 + 3 = 5

15

156

2 + 3 = 5

The factors of 91 are: 1 7 13 91.The prime factors are: 7 x 13The sum of the prime factors = 7 + 13 = 20

217

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