21649640

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{307}}^1$

素因数の和:402

約数の個数: 64

約数和(自身を含む): 51226560

約数和(自身を除く): 29576920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 43, 82, 86, 164, 172, 205, 215, 307, 328, 344, 410, 430, 614, 820, 860, 1228, 1535, 1640, 1720, 1763, 2456, 3070, 3526, 6140, 7052, 8815, 12280, 12587, 13201, 14104, 17630, 25174, 26402, 35260, 50348, 52804, 62935, 66005, 70520, 100696, 105608, 125870, 132010, 251740, 264020, 503480, 528040, 541241, 1082482, 2164964, 2706205, 4329928, 5412410, 10824820, 21649640]

約数ペア:

[(1, 21649640), (2, 10824820), (4, 5412410), (5, 4329928), (8, 2706205), (10, 2164964), (20, 1082482), (40, 541241), (41, 528040), (43, 503480), (82, 264020), (86, 251740), (164, 132010), (172, 125870), (205, 105608), (215, 100696), (307, 70520), (328, 66005), (344, 62935), (410, 52804), (430, 50348), (614, 35260), (820, 26402), (860, 25174), (1228, 17630), (1535, 14104), (1640, 13201), (1720, 12587), (1763, 12280), (2456, 8815), (3070, 7052), (3526, 6140)]