408640280

素因数分解:

$2^3\times 5^1\times {\mathrm{127}}^1\times {\mathrm{257}}^1\times {\mathrm{313}}^1$

素因数の和:708

約数の個数: 64

約数和(自身を含む): 933258240

約数和(自身を除く): 524617960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 127, 254, 257, 313, 508, 514, 626, 635, 1016, 1028, 1252, 1270, 1285, 1565, 2056, 2504, 2540, 2570, 3130, 5080, 5140, 6260, 10280, 12520, 32639, 39751, 65278, 79502, 80441, 130556, 159004, 160882, 163195, 198755, 261112, 318008, 321764, 326390, 397510, 402205, 643528, 652780, 795020, 804410, 1305560, 1590040, 1608820, 3217640, 10216007, 20432014, 40864028, 51080035, 81728056, 102160070, 204320140, 408640280]

約数ペア:

[(1, 408640280), (2, 204320140), (4, 102160070), (5, 81728056), (8, 51080035), (10, 40864028), (20, 20432014), (40, 10216007), (127, 3217640), (254, 1608820), (257, 1590040), (313, 1305560), (508, 804410), (514, 795020), (626, 652780), (635, 643528), (1016, 402205), (1028, 397510), (1252, 326390), (1270, 321764), (1285, 318008), (1565, 261112), (2056, 198755), (2504, 163195), (2540, 160882), (2570, 159004), (3130, 130556), (5080, 80441), (5140, 79502), (6260, 65278), (10280, 39751), (12520, 32639)]