398960

素因数分解:

$2^4\times 5^1\times {\mathrm{4987}}^1$

素因数の和:5000

約数の個数: 20

約数和(自身を含む): 927768

約数和(自身を除く): 528808

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 4987, 9974, 19948, 24935, 39896, 49870, 79792, 99740, 199480, 398960]

約数ペア:

[(1, 398960), (2, 199480), (4, 99740), (5, 79792), (8, 49870), (10, 39896), (16, 24935), (20, 19948), (40, 9974), (80, 4987)]