👉 In mathematics, an isandrous number (or simply is androus) is a positive integer that is equal to the sum of its proper divisors. This means that it can be divided evenly into another number without leaving any remainder. For example, 6 has two proper divisors: 1 and 2. Therefore, 6 is an isandrous number. Is androus numbers are important in combinatorial mathematics because they allow one to determine the total number of subsets (i
