The factors of the number 15,213,528 are: 1, 2, 3, 4, 6, 8, 9, 11, 12, 18, 19, 22, 24, 27, 33, 36, 38, 44, 54, 57, 66, 72, 76, 88, 99, 108, 114, 132, 152, 171, 198, 209, 216, 228, 264, 297, 337, 342, 396, 418, 456, 513, 594, 627, 674, 684, 792, 836, 1011, 1026, 1188, 1254, 1348, 1368, 1672, 1881, 2022, 2052, 2376, 2508, 2696, 3033, 3707, 3762, 4044, 4104, 5016, 5643, 6066, 6403, 7414, 7524, 8088, 9099, 11121, 11286, 12132, 12806, 14828, 15048, 18198, 19209, 22242, 22572, 24264, 25612, 29656, 33363, 36396, 38418, 44484, 45144, 51224, 57627, 66726, 70433, 72792, 76836, 88968, 100089, 115254, 133452, 140866, 153672, 172881, 200178, 211299, 230508, 266904, 281732, 345762, 400356, 422598, 461016, 563464, 633897, 691524, 800712, 845196, 1267794, 1383048, 1690392, 1901691, 2535588, 3803382, 5071176, 7606764, 15213528.
If you add them up, you will get the total of 48,672,000.