20880145

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{53}}^1$

素因数の和:130

約数の個数: 64

約数和(自身を含む): 32659200

約数和(自身を除く): 11779055

約数列:

[1, 5, 11, 13, 19, 29, 53, 55, 65, 95, 143, 145, 209, 247, 265, 319, 377, 551, 583, 689, 715, 1007, 1045, 1235, 1537, 1595, 1885, 2717, 2755, 2915, 3445, 4147, 5035, 6061, 7163, 7579, 7685, 11077, 13091, 13585, 16907, 19981, 20735, 29203, 30305, 35815, 37895, 55385, 65455, 78793, 84535, 99905, 144001, 146015, 219791, 321233, 379639, 393965, 720005, 1098955, 1606165, 1898195, 4176029, 20880145]

約数ペア:

[(1, 20880145), (5, 4176029), (11, 1898195), (13, 1606165), (19, 1098955), (29, 720005), (53, 393965), (55, 379639), (65, 321233), (95, 219791), (143, 146015), (145, 144001), (209, 99905), (247, 84535), (265, 78793), (319, 65455), (377, 55385), (551, 37895), (583, 35815), (689, 30305), (715, 29203), (1007, 20735), (1045, 19981), (1235, 16907), (1537, 13585), (1595, 13091), (1885, 11077), (2717, 7685), (2755, 7579), (2915, 7163), (3445, 6061), (4147, 5035)]