1287940

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{907}}^1$

素因数の和:987

約数の個数: 24

約数和(自身を含む): 2745792

約数和(自身を除く): 1457852

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 907, 1420, 1814, 3628, 4535, 9070, 18140, 64397, 128794, 257588, 321985, 643970, 1287940]

約数ペア:

[(1, 1287940), (2, 643970), (4, 321985), (5, 257588), (10, 128794), (20, 64397), (71, 18140), (142, 9070), (284, 4535), (355, 3628), (710, 1814), (907, 1420)]