20720007

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{1031}}^1$

素因数の和:1084

約数の個数: 48

約数和(自身を含む): 38638080

約数和(自身を除く): 17918073

約数列:

[1, 3, 7, 9, 11, 21, 29, 33, 63, 77, 87, 99, 203, 231, 261, 319, 609, 693, 957, 1031, 1827, 2233, 2871, 3093, 6699, 7217, 9279, 11341, 20097, 21651, 29899, 34023, 64953, 79387, 89697, 102069, 209293, 238161, 269091, 328889, 627879, 714483, 986667, 1883637, 2302223, 2960001, 6906669, 20720007]

約数ペア:

[(1, 20720007), (3, 6906669), (7, 2960001), (9, 2302223), (11, 1883637), (21, 986667), (29, 714483), (33, 627879), (63, 328889), (77, 269091), (87, 238161), (99, 209293), (203, 102069), (231, 89697), (261, 79387), (319, 64953), (609, 34023), (693, 29899), (957, 21651), (1031, 20097), (1827, 11341), (2233, 9279), (2871, 7217), (3093, 6699)]