21139785

素因数分解:

$3^5\times 5^1\times {\mathrm{127}}^1\times {\mathrm{137}}^1$

素因数の和:284

約数の個数: 48

約数和(自身を含む): 38578176

約数和(自身を除く): 17438391

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 127, 135, 137, 243, 381, 405, 411, 635, 685, 1143, 1215, 1233, 1905, 2055, 3429, 3699, 5715, 6165, 10287, 11097, 17145, 17399, 18495, 30861, 33291, 51435, 52197, 55485, 86995, 154305, 156591, 166455, 260985, 469773, 782955, 1409319, 2348865, 4227957, 7046595, 21139785]

約数ペア:

[(1, 21139785), (3, 7046595), (5, 4227957), (9, 2348865), (15, 1409319), (27, 782955), (45, 469773), (81, 260985), (127, 166455), (135, 156591), (137, 154305), (243, 86995), (381, 55485), (405, 52197), (411, 51435), (635, 33291), (685, 30861), (1143, 18495), (1215, 17399), (1233, 17145), (1905, 11097), (2055, 10287), (3429, 6165), (3699, 5715)]