ELI5: Explain Like I'm 5

Almost perfect number

Okay kiddo, are you ready to learn about almost perfect numbers?

So, you know what a perfect number is right? It's a special number where if you add up all the numbers that can divide into it (except itself) you get the number itself as the answer. For example, 6 is a perfect number because its factors (besides itself) are 1, 2, and 3, and 1+2+3=6.

Now, an almost perfect number is kind of like a perfect number, but not quite. It's a number where if you add up all the numbers that can divide into it (except itself), you get a number that's really close to the original number, but not equal to it.

For example, let's take the number 12. Its factors (besides itself) are 1, 2, 3, 4, and 6. If we add those up, we get 16, which is pretty close to 12, but not exactly the same. So 12 is an almost perfect number.

Scientists and mathematicians are really interested in almost perfect numbers because they're quite rare and hard to find. It's kind of like finding a treasure! Some examples of almost perfect numbers are 2,760, 4,368, and 20,960.

So, there you have it, kiddo! Almost perfect numbers are special numbers where if you add up all the factors (besides itself) you get a number that's really close to the original number, but not quite the same. It's like finding a treasure and scientists are always looking for them!
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