20901920

素因数分解:

$2^5\times 5^1\times {\mathrm{13}}^2\times {\mathrm{773}}^1$

素因数の和:814

約数の個数: 72

約数和(自身を含む): 53540676

約数和(自身を除く): 32638756

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 65, 80, 104, 130, 160, 169, 208, 260, 338, 416, 520, 676, 773, 845, 1040, 1352, 1546, 1690, 2080, 2704, 3092, 3380, 3865, 5408, 6184, 6760, 7730, 10049, 12368, 13520, 15460, 20098, 24736, 27040, 30920, 40196, 50245, 61840, 80392, 100490, 123680, 130637, 160784, 200980, 261274, 321568, 401960, 522548, 653185, 803920, 1045096, 1306370, 1607840, 2090192, 2612740, 4180384, 5225480, 10450960, 20901920]

約数ペア:

[(1, 20901920), (2, 10450960), (4, 5225480), (5, 4180384), (8, 2612740), (10, 2090192), (13, 1607840), (16, 1306370), (20, 1045096), (26, 803920), (32, 653185), (40, 522548), (52, 401960), (65, 321568), (80, 261274), (104, 200980), (130, 160784), (160, 130637), (169, 123680), (208, 100490), (260, 80392), (338, 61840), (416, 50245), (520, 40196), (676, 30920), (773, 27040), (845, 24736), (1040, 20098), (1352, 15460), (1546, 13520), (1690, 12368), (2080, 10049), (2704, 7730), (3092, 6760), (3380, 6184), (3865, 5408)]