text: answer a) 2087\n\nFirst factor 960 = 3*5*(2^6)\n\nSet of divisors excluding 1 and 960 =\n\npowers of 2 = 2,4,8,16,32,64\n\n3 and (powers of 2)x3 = 3,6,12,24,48,96,192\n\n5 and (powers of 2)x5 = 5,10,20,40,80,160,320\n\n3x5 and (powers of 2)x15 = 15,30,60,120,240,480,\n\nSum of all = 2087