394840

素因数分解:

$2^3\times 5^1\times {\mathrm{9871}}^1$

素因数の和:9882

約数の個数: 16

約数和(自身を含む): 888480

約数和(自身を除く): 493640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 9871, 19742, 39484, 49355, 78968, 98710, 197420, 394840]

約数ペア:

[(1, 394840), (2, 197420), (4, 98710), (5, 78968), (8, 49355), (10, 39484), (20, 19742), (40, 9871)]