81972220

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{239}}^1\times {\mathrm{1559}}^1$

素因数の和:1818

約数の個数: 48

約数和(自身を含む): 188697600

約数和(自身を除く): 106725380

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 239, 478, 956, 1195, 1559, 2390, 2629, 3118, 4780, 5258, 6236, 7795, 10516, 13145, 15590, 17149, 26290, 31180, 34298, 52580, 68596, 85745, 171490, 342980, 372601, 745202, 1490404, 1863005, 3726010, 4098611, 7452020, 8197222, 16394444, 20493055, 40986110, 81972220]

約数ペア:

[(1, 81972220), (2, 40986110), (4, 20493055), (5, 16394444), (10, 8197222), (11, 7452020), (20, 4098611), (22, 3726010), (44, 1863005), (55, 1490404), (110, 745202), (220, 372601), (239, 342980), (478, 171490), (956, 85745), (1195, 68596), (1559, 52580), (2390, 34298), (2629, 31180), (3118, 26290), (4780, 17149), (5258, 15590), (6236, 13145), (7795, 10516)]