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過剰数
noun
(number theory) abundant number, a number that is smaller than the sum of its proper divisors
完全数
noun
(number theory) perfect number, a positive integer that is equal to the sum of its positive divisors, excluding the number itself
不足数
noun
(number theory) deficient number, a number for which the sum of proper divisors is less than that number
友愛数
noun
(number theory) amicable numbers, two different numbers related in such a way that the sum of the proper divisors of each is equal to the other number.
帯水層
noun
aquifer (an underground layer of water-bearing porous stone, earth, or gravel)
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