867640

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{199}}^1$

素因数の和:319

約数の個数: 32

約数和(自身を含む): 1980000

約数和(自身を除く): 1112360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 199, 218, 398, 436, 545, 796, 872, 995, 1090, 1592, 1990, 2180, 3980, 4360, 7960, 21691, 43382, 86764, 108455, 173528, 216910, 433820, 867640]

約数ペア:

[(1, 867640), (2, 433820), (4, 216910), (5, 173528), (8, 108455), (10, 86764), (20, 43382), (40, 21691), (109, 7960), (199, 4360), (218, 3980), (398, 2180), (436, 1990), (545, 1592), (796, 1090), (872, 995)]