21971290

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{199739}}^1$

素因数の和:199757

約数の個数: 16

約数和(自身を含む): 43143840

約数和(自身を除く): 21172550

約数列:

[1, 2, 5, 10, 11, 22, 55, 110, 199739, 399478, 998695, 1997390, 2197129, 4394258, 10985645, 21971290]

約数ペア:

[(1, 21971290), (2, 10985645), (5, 4394258), (10, 2197129), (11, 1997390), (22, 998695), (55, 399478), (110, 199739)]