20518575

素因数分解:

$3^1\times 5^2\times 7^1\times {\mathrm{11}}^2\times {\mathrm{17}}^1\times {\mathrm{19}}^1$

素因数の和:78

約数の個数: 144

約数和(自身を含む): 47496960

約数和(自身を除く): 26978385

約数列:

[1, 3, 5, 7, 11, 15, 17, 19, 21, 25, 33, 35, 51, 55, 57, 75, 77, 85, 95, 105, 119, 121, 133, 165, 175, 187, 209, 231, 255, 275, 285, 323, 357, 363, 385, 399, 425, 475, 525, 561, 595, 605, 627, 665, 825, 847, 935, 969, 1045, 1155, 1275, 1309, 1425, 1463, 1615, 1785, 1815, 1925, 1995, 2057, 2261, 2299, 2541, 2805, 2975, 3025, 3135, 3325, 3553, 3927, 4235, 4389, 4675, 4845, 5225, 5775, 6171, 6545, 6783, 6897, 7315, 8075, 8925, 9075, 9975, 10285, 10659, 11305, 11495, 12705, 14025, 14399, 15675, 16093, 17765, 19635, 21175, 21945, 24225, 24871, 30855, 32725, 33915, 34485, 36575, 39083, 43197, 48279, 51425, 53295, 56525, 57475, 63525, 71995, 74613, 80465, 88825, 98175, 109725, 117249, 124355, 154275, 169575, 172425, 195415, 215985, 241395, 266475, 273581, 359975, 373065, 402325, 586245, 621775, 820743, 977075, 1079925, 1206975, 1367905, 1865325, 2931225, 4103715, 6839525, 20518575]

約数ペア:

[(1, 20518575), (3, 6839525), (5, 4103715), (7, 2931225), (11, 1865325), (15, 1367905), (17, 1206975), (19, 1079925), (21, 977075), (25, 820743), (33, 621775), (35, 586245), (51, 402325), (55, 373065), (57, 359975), (75, 273581), (77, 266475), (85, 241395), (95, 215985), (105, 195415), (119, 172425), (121, 169575), (133, 154275), (165, 124355), (175, 117249), (187, 109725), (209, 98175), (231, 88825), (255, 80465), (275, 74613), (285, 71995), (323, 63525), (357, 57475), (363, 56525), (385, 53295), (399, 51425), (425, 48279), (475, 43197), (525, 39083), (561, 36575), (595, 34485), (605, 33915), (627, 32725), (665, 30855), (825, 24871), (847, 24225), (935, 21945), (969, 21175), (1045, 19635), (1155, 17765), (1275, 16093), (1309, 15675), (1425, 14399), (1463, 14025), (1615, 12705), (1785, 11495), (1815, 11305), (1925, 10659), (1995, 10285), (2057, 9975), (2261, 9075), (2299, 8925), (2541, 8075), (2805, 7315), (2975, 6897), (3025, 6783), (3135, 6545), (3325, 6171), (3553, 5775), (3927, 5225), (4235, 4845), (4389, 4675)]