649640

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{149}}^1$

素因数の和:269

約数の個数: 32

約数和(自身を含む): 1485000

約数和(自身を除く): 835360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 149, 218, 298, 436, 545, 596, 745, 872, 1090, 1192, 1490, 2180, 2980, 4360, 5960, 16241, 32482, 64964, 81205, 129928, 162410, 324820, 649640]

約数ペア:

[(1, 649640), (2, 324820), (4, 162410), (5, 129928), (8, 81205), (10, 64964), (20, 32482), (40, 16241), (109, 5960), (149, 4360), (218, 2980), (298, 2180), (436, 1490), (545, 1192), (596, 1090), (745, 872)]