21109209

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{131}}^1\times {\mathrm{257}}^1$

素因数の和:421

約数の個数: 32

約数和(自身を含む): 32693760

約数和(自身を除く): 11584551

約数列:

[1, 3, 11, 19, 33, 57, 131, 209, 257, 393, 627, 771, 1441, 2489, 2827, 4323, 4883, 7467, 8481, 14649, 27379, 33667, 53713, 82137, 101001, 161139, 370337, 639673, 1111011, 1919019, 7036403, 21109209]

約数ペア:

[(1, 21109209), (3, 7036403), (11, 1919019), (19, 1111011), (33, 639673), (57, 370337), (131, 161139), (209, 101001), (257, 82137), (393, 53713), (627, 33667), (771, 27379), (1441, 14649), (2489, 8481), (2827, 7467), (4323, 4883)]