21131517

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{71}}^1\times {\mathrm{311}}^1$

素因数の和:425

約数の個数: 32

約数和(自身を含む): 32348160

約数和(自身を除く): 11216643

約数列:

[1, 3, 11, 29, 33, 71, 87, 213, 311, 319, 781, 933, 957, 2059, 2343, 3421, 6177, 9019, 10263, 22081, 22649, 27057, 66243, 67947, 99209, 242891, 297627, 640349, 728673, 1921047, 7043839, 21131517]

約数ペア:

[(1, 21131517), (3, 7043839), (11, 1921047), (29, 728673), (33, 640349), (71, 297627), (87, 242891), (213, 99209), (311, 67947), (319, 66243), (781, 27057), (933, 22649), (957, 22081), (2059, 10263), (2343, 9019), (3421, 6177)]