21072220

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81047}}^1$

素因数の和:81069

約数の個数: 24

約数和(自身を含む): 47656224

約数和(自身を除く): 26584004

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81047, 162094, 324188, 405235, 810470, 1053611, 1620940, 2107222, 4214444, 5268055, 10536110, 21072220]

約数ペア:

[(1, 21072220), (2, 10536110), (4, 5268055), (5, 4214444), (10, 2107222), (13, 1620940), (20, 1053611), (26, 810470), (52, 405235), (65, 324188), (130, 162094), (260, 81047)]