| 单词 | perfect number |
| 释义 | perfect numberˌperfect ˈnumber noun [countable] math a number that is equal to the sum of its factors (=the numbers that divide into another number exactly) added together, except for itself: 6 is a perfect number because its factors, other than 6, add up to 6: 1 + 2 + 3 = 6. |
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