21407925

素因数分解:

$3^1\times 5^2\times 7^1\times {\mathrm{11}}^2\times {\mathrm{337}}^1$

素因数の和:379

約数の個数: 72

約数和(自身を含む): 44594368

約数和(自身を除く): 23186443

約数列:

[1, 3, 5, 7, 11, 15, 21, 25, 33, 35, 55, 75, 77, 105, 121, 165, 175, 231, 275, 337, 363, 385, 525, 605, 825, 847, 1011, 1155, 1685, 1815, 1925, 2359, 2541, 3025, 3707, 4235, 5055, 5775, 7077, 8425, 9075, 11121, 11795, 12705, 18535, 21175, 25275, 25949, 35385, 40777, 55605, 58975, 63525, 77847, 92675, 122331, 129745, 176925, 203885, 278025, 285439, 389235, 611655, 648725, 856317, 1019425, 1427195, 1946175, 3058275, 4281585, 7135975, 21407925]

約数ペア:

[(1, 21407925), (3, 7135975), (5, 4281585), (7, 3058275), (11, 1946175), (15, 1427195), (21, 1019425), (25, 856317), (33, 648725), (35, 611655), (55, 389235), (75, 285439), (77, 278025), (105, 203885), (121, 176925), (165, 129745), (175, 122331), (231, 92675), (275, 77847), (337, 63525), (363, 58975), (385, 55605), (525, 40777), (605, 35385), (825, 25949), (847, 25275), (1011, 21175), (1155, 18535), (1685, 12705), (1815, 11795), (1925, 11121), (2359, 9075), (2541, 8425), (3025, 7077), (3707, 5775), (4235, 5055)]