21057165

素因数分解:

$3^6\times 5^1\times {\mathrm{53}}^1\times {\mathrm{109}}^1$

素因数の和:185

約数の個数: 56

約数和(自身を含む): 38954520

約数和(自身を除く): 17897355

約数列:

[1, 3, 5, 9, 15, 27, 45, 53, 81, 109, 135, 159, 243, 265, 327, 405, 477, 545, 729, 795, 981, 1215, 1431, 1635, 2385, 2943, 3645, 4293, 4905, 5777, 7155, 8829, 12879, 14715, 17331, 21465, 26487, 28885, 38637, 44145, 51993, 64395, 79461, 86655, 132435, 155979, 193185, 259965, 397305, 467937, 779895, 1403811, 2339685, 4211433, 7019055, 21057165]

約数ペア:

[(1, 21057165), (3, 7019055), (5, 4211433), (9, 2339685), (15, 1403811), (27, 779895), (45, 467937), (53, 397305), (81, 259965), (109, 193185), (135, 155979), (159, 132435), (243, 86655), (265, 79461), (327, 64395), (405, 51993), (477, 44145), (545, 38637), (729, 28885), (795, 26487), (981, 21465), (1215, 17331), (1431, 14715), (1635, 12879), (2385, 8829), (2943, 7155), (3645, 5777), (4293, 4905)]