398800

素因数分解:

$2^4\times 5^2\times {\mathrm{997}}^1$

素因数の和:1015

約数の個数: 30

約数和(自身を含む): 959078

約数和(自身を除く): 560278

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 997, 1994, 3988, 4985, 7976, 9970, 15952, 19940, 24925, 39880, 49850, 79760, 99700, 199400, 398800]

約数ペア:

[(1, 398800), (2, 199400), (4, 99700), (5, 79760), (8, 49850), (10, 39880), (16, 24925), (20, 19940), (25, 15952), (40, 9970), (50, 7976), (80, 4985), (100, 3988), (200, 1994), (400, 997)]