1.
8 = 2*4, 1*8,
25 = 5*5, 1*25,
27 = 3*9, 1*27,
48 = 1*48, 2*24, 3*16, 4*12, 6*8,
64 = 1*64, 2*32, 4*16, 8*8,
120 = 1*120, 2*60, 3*40, 4*30, 5*24, 6*20, 8*15, 10*12,
250 = 1*250, 2*125, 5*50, 10*25,
300 = 1*300, 2*150, 3*100, 4*75, 5*60, 6*50, 10*30, 15*20,
480 = 1*480, 2*240, 3*160, 4*120, 6*80 и т.д.
2.
11 ⇒ 1 и 11,
20 ⇒ 1, 2, 4, 5, 10, 20