21902991

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{181}}^1\times {\mathrm{193}}^1$

素因数の和:407

約数の個数: 32

約数和(自身を含む): 33895680

約数和(自身を除く): 11992689

約数列:

[1, 3, 11, 19, 33, 57, 181, 193, 209, 543, 579, 627, 1991, 2123, 3439, 3667, 5973, 6369, 10317, 11001, 34933, 37829, 40337, 104799, 113487, 121011, 384263, 663727, 1152789, 1991181, 7300997, 21902991]

約数ペア:

[(1, 21902991), (3, 7300997), (11, 1991181), (19, 1152789), (33, 663727), (57, 384263), (181, 121011), (193, 113487), (209, 104799), (543, 40337), (579, 37829), (627, 34933), (1991, 11001), (2123, 10317), (3439, 6369), (3667, 5973)]