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Original link https://www.cnblogs.com/zhouzhendong/p/CF542D.htmlQuestion portal-cf542d question portal-51nod1477 Define the formula $ J (x) = \ sum _ {1 \ Leq k \ Leq X and k | X and \ gcd (K, X/K) = 1} k $. Given an integer $ A $, the number of positive integers $ x $ must be equal to $ J (x) = A $. $ X | N $ indicates that $ x $ is a factor of $ N $. $ \ Gcd (a, B) indicates the maximum common divisor of $ A $ and $ B $. $1 \ Leq A \ Leq 10 ^ {12} $Question Consider how to calculate $ J (x) $

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