Numbers / 205

The Number 205

205 is composite: factorization 5 × 41. That gives 205 exactly 4 divisors: 1, 5, 41, 205. 205's proper divisors total just 47, 158 short of 205, the deficient case most of 205's neighbors share too. 205 has a digit sum of 7; for 205, the digital root works out to 7. 205: 5 all divide 205 evenly, out of 2-12. 205 is 11001101 in binary and CD in hex; as a Roman numeral it's CCV.