21305990

素因数分解:

$2^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{68729}}^1$

素因数の和:68767

約数の個数: 16

約数和(自身を含む): 39588480

約数和(自身を除く): 18282490

約数列:

[1, 2, 5, 10, 31, 62, 155, 310, 68729, 137458, 343645, 687290, 2130599, 4261198, 10652995, 21305990]

約数ペア:

[(1, 21305990), (2, 10652995), (5, 4261198), (10, 2130599), (31, 687290), (62, 343645), (155, 137458), (310, 68729)]