20979819

素因数分解:

$3^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{1031}}^1$

素因数の和:1080

約数の個数: 48

約数和(自身を含む): 38638080

約数和(自身を除く): 17658261

約数列:

[1, 3, 7, 9, 17, 19, 21, 51, 57, 63, 119, 133, 153, 171, 323, 357, 399, 969, 1031, 1071, 1197, 2261, 2907, 3093, 6783, 7217, 9279, 17527, 19589, 20349, 21651, 52581, 58767, 64953, 122689, 137123, 157743, 176301, 333013, 368067, 411369, 999039, 1104201, 1234107, 2331091, 2997117, 6993273, 20979819]

約数ペア:

[(1, 20979819), (3, 6993273), (7, 2997117), (9, 2331091), (17, 1234107), (19, 1104201), (21, 999039), (51, 411369), (57, 368067), (63, 333013), (119, 176301), (133, 157743), (153, 137123), (171, 122689), (323, 64953), (357, 58767), (399, 52581), (969, 21651), (1031, 20349), (1071, 19589), (1197, 17527), (2261, 9279), (2907, 7217), (3093, 6783)]