399021680

素因数分解:

$2^4\times 5^1\times {\mathrm{4987771}}^1$

素因数の和:4987784

約数の個数: 20

約数和(自身を含む): 927725592

約数和(自身を除く): 528703912

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 4987771, 9975542, 19951084, 24938855, 39902168, 49877710, 79804336, 99755420, 199510840, 399021680]

約数ペア:

[(1, 399021680), (2, 199510840), (4, 99755420), (5, 79804336), (8, 49877710), (10, 39902168), (16, 24938855), (20, 19951084), (40, 9975542), (80, 4987771)]