399400

素因数分解:

$2^3\times 5^2\times {\mathrm{1997}}^1$

素因数の和:2013

約数の個数: 24

約数和(自身を含む): 929070

約数和(自身を除く): 529670

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200, 1997, 3994, 7988, 9985, 15976, 19970, 39940, 49925, 79880, 99850, 199700, 399400]

約数ペア:

[(1, 399400), (2, 199700), (4, 99850), (5, 79880), (8, 49925), (10, 39940), (20, 19970), (25, 15976), (40, 9985), (50, 7988), (100, 3994), (200, 1997)]