21991420

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{99961}}^1$

素因数の和:99981

約数の個数: 24

約数和(自身を含む): 50380848

約数和(自身を除く): 28389428

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 99961, 199922, 399844, 499805, 999610, 1099571, 1999220, 2199142, 4398284, 5497855, 10995710, 21991420]

約数ペア:

[(1, 21991420), (2, 10995710), (4, 5497855), (5, 4398284), (10, 2199142), (11, 1999220), (20, 1099571), (22, 999610), (44, 499805), (55, 399844), (110, 199922), (220, 99961)]