18185560

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{97}}^1\times {\mathrm{109}}^1$

素因数の和:260

約数の個数: 64

約数和(自身を含む): 42688800

約数和(自身を除く): 24503240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 97, 109, 172, 194, 215, 218, 344, 388, 430, 436, 485, 545, 776, 860, 872, 970, 1090, 1720, 1940, 2180, 3880, 4171, 4360, 4687, 8342, 9374, 10573, 16684, 18748, 20855, 21146, 23435, 33368, 37496, 41710, 42292, 46870, 52865, 83420, 84584, 93740, 105730, 166840, 187480, 211460, 422920, 454639, 909278, 1818556, 2273195, 3637112, 4546390, 9092780, 18185560]

約数ペア:

[(1, 18185560), (2, 9092780), (4, 4546390), (5, 3637112), (8, 2273195), (10, 1818556), (20, 909278), (40, 454639), (43, 422920), (86, 211460), (97, 187480), (109, 166840), (172, 105730), (194, 93740), (215, 84584), (218, 83420), (344, 52865), (388, 46870), (430, 42292), (436, 41710), (485, 37496), (545, 33368), (776, 23435), (860, 21146), (872, 20855), (970, 18748), (1090, 16684), (1720, 10573), (1940, 9374), (2180, 8342), (3880, 4687), (4171, 4360)]