21987845

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{397}}^1$

素因数の和:485

約数の個数: 32

約数和(自身を含む): 30948480

約数和(自身を除く): 8960635

約数列:

[1, 5, 11, 19, 53, 55, 95, 209, 265, 397, 583, 1007, 1045, 1985, 2915, 4367, 5035, 7543, 11077, 21041, 21835, 37715, 55385, 82973, 105205, 231451, 399779, 414865, 1157255, 1998895, 4397569, 21987845]

約数ペア:

[(1, 21987845), (5, 4397569), (11, 1998895), (19, 1157255), (53, 414865), (55, 399779), (95, 231451), (209, 105205), (265, 82973), (397, 55385), (583, 37715), (1007, 21835), (1045, 21041), (1985, 11077), (2915, 7543), (4367, 5035)]