81243740

素因数分解:

$2^2\times 5^1\times {\mathrm{137}}^1\times {\mathrm{149}}^1\times {\mathrm{199}}^1$

素因数の和:494

約数の個数: 48

約数和(自身を含む): 173880000

約数和(自身を除く): 92636260

約数列:

[1, 2, 4, 5, 10, 20, 137, 149, 199, 274, 298, 398, 548, 596, 685, 745, 796, 995, 1370, 1490, 1990, 2740, 2980, 3980, 20413, 27263, 29651, 40826, 54526, 59302, 81652, 102065, 109052, 118604, 136315, 148255, 204130, 272630, 296510, 408260, 545260, 593020, 4062187, 8124374, 16248748, 20310935, 40621870, 81243740]

約数ペア:

[(1, 81243740), (2, 40621870), (4, 20310935), (5, 16248748), (10, 8124374), (20, 4062187), (137, 593020), (149, 545260), (199, 408260), (274, 296510), (298, 272630), (398, 204130), (548, 148255), (596, 136315), (685, 118604), (745, 109052), (796, 102065), (995, 81652), (1370, 59302), (1490, 54526), (1990, 40826), (2740, 29651), (2980, 27263), (3980, 20413)]