......................
20=20+8
28 = 7 * 2 * 2 96 = 3 * 2 * 2 * 2 * 2 * 2 164 = 2 * 2 * 41 600 = 5 * 3 * 5 * 2 * 2 * 2 375 = 5 * 5 * 5 * 3 7000 = 7 * 5 * 5 * 5 * 2 * 2 * 2