1) 不足数 Parts 不足 数 Link copied! Meaning Wikipedia EN In number theory, a deficient or deficient number is a number n for which the sum of divisors σ(n)<2n, or, equivalently, the sum of proper divisors (or aliqu... More Kanji 不 フ negative, non-, bad 足 ソク leg, foot, be sufficient 数 スウ number, strength, fate
