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284 (number) : ウィキペディア英語版 | 284 (number)
Two hundred eighty-four (284, CCLXXXIV) is the natural number following 283 and preceding 285. Its divisors are 1, 2, 4, 71, and 142, adding up to 220, in turn, the divisors of 220 add up to 284, making the two a pair of amicable numbers. There is no answer to the equation φ(x) = 284, making 284 a nontotient. ==In other fields== See also the year 284 and List of highways numbered 284.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「284 (number)」の詳細全文を読む
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