18123640

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{257}}^1$

素因数の和:352

約数の個数: 64

約数和(自身を含む): 42910560

約数和(自身を除く): 24786920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 43, 82, 86, 164, 172, 205, 215, 257, 328, 344, 410, 430, 514, 820, 860, 1028, 1285, 1640, 1720, 1763, 2056, 2570, 3526, 5140, 7052, 8815, 10280, 10537, 11051, 14104, 17630, 21074, 22102, 35260, 42148, 44204, 52685, 55255, 70520, 84296, 88408, 105370, 110510, 210740, 221020, 421480, 442040, 453091, 906182, 1812364, 2265455, 3624728, 4530910, 9061820, 18123640]

約数ペア:

[(1, 18123640), (2, 9061820), (4, 4530910), (5, 3624728), (8, 2265455), (10, 1812364), (20, 906182), (40, 453091), (41, 442040), (43, 421480), (82, 221020), (86, 210740), (164, 110510), (172, 105370), (205, 88408), (215, 84296), (257, 70520), (328, 55255), (344, 52685), (410, 44204), (430, 42148), (514, 35260), (820, 22102), (860, 21074), (1028, 17630), (1285, 14104), (1640, 11051), (1720, 10537), (1763, 10280), (2056, 8815), (2570, 7052), (3526, 5140)]