399980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{2857}}^1$

素因数の和:2873

約数の個数: 24

約数和(自身を含む): 960288

約数和(自身を除く): 560308

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 2857, 5714, 11428, 14285, 19999, 28570, 39998, 57140, 79996, 99995, 199990, 399980]

約数ペア:

[(1, 399980), (2, 199990), (4, 99995), (5, 79996), (7, 57140), (10, 39998), (14, 28570), (20, 19999), (28, 14285), (35, 11428), (70, 5714), (140, 2857)]