18981520

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^2\times {\mathrm{821}}^1$

素因数の和:868

約数の個数: 60

約数和(自身を含む): 46937844

約数和(自身を除く): 27956324

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 289, 340, 578, 680, 821, 1156, 1360, 1445, 1642, 2312, 2890, 3284, 4105, 4624, 5780, 6568, 8210, 11560, 13136, 13957, 16420, 23120, 27914, 32840, 55828, 65680, 69785, 111656, 139570, 223312, 237269, 279140, 474538, 558280, 949076, 1116560, 1186345, 1898152, 2372690, 3796304, 4745380, 9490760, 18981520]

約数ペア:

[(1, 18981520), (2, 9490760), (4, 4745380), (5, 3796304), (8, 2372690), (10, 1898152), (16, 1186345), (17, 1116560), (20, 949076), (34, 558280), (40, 474538), (68, 279140), (80, 237269), (85, 223312), (136, 139570), (170, 111656), (272, 69785), (289, 65680), (340, 55828), (578, 32840), (680, 27914), (821, 23120), (1156, 16420), (1360, 13957), (1445, 13136), (1642, 11560), (2312, 8210), (2890, 6568), (3284, 5780), (4105, 4624)]