21820311

素因数分解:

$3^2\times {\mathrm{31}}^1\times {\mathrm{197}}^1\times {\mathrm{397}}^1$

素因数の和:631

約数の個数: 24

約数和(自身を含む): 32782464

約数和(自身を除く): 10962153

約数列:

[1, 3, 9, 31, 93, 197, 279, 397, 591, 1191, 1773, 3573, 6107, 12307, 18321, 36921, 54963, 78209, 110763, 234627, 703881, 2424479, 7273437, 21820311]

約数ペア:

[(1, 21820311), (3, 7273437), (9, 2424479), (31, 703881), (93, 234627), (197, 110763), (279, 78209), (397, 54963), (591, 36921), (1191, 18321), (1773, 12307), (3573, 6107)]