21000209020

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{41}}^1\times {\mathrm{1693}}^1\times {\mathrm{2161}}^1$

素因数の和:3911

約数の個数: 96

約数和(自身を含む): 51684183936

約数和(自身を除く): 30683974916

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 41, 70, 82, 140, 164, 205, 287, 410, 574, 820, 1148, 1435, 1693, 2161, 2870, 3386, 4322, 5740, 6772, 8465, 8644, 10805, 11851, 15127, 16930, 21610, 23702, 30254, 33860, 43220, 47404, 59255, 60508, 69413, 75635, 88601, 118510, 138826, 151270, 177202, 237020, 277652, 302540, 347065, 354404, 443005, 485891, 620207, 694130, 886010, 971782, 1240414, 1388260, 1772020, 1943564, 2429455, 2480828, 3101035, 3658573, 4858910, 6202070, 7317146, 9717820, 12404140, 14634292, 18292865, 25610011, 36585730, 51220022, 73171460, 102440044, 128050055, 150001493, 256100110, 300002986, 512200220, 600005972, 750007465, 1050010451, 1500014930, 2100020902, 3000029860, 4200041804, 5250052255, 10500104510, 21000209020]

約数ペア:

[(1, 21000209020), (2, 10500104510), (4, 5250052255), (5, 4200041804), (7, 3000029860), (10, 2100020902), (14, 1500014930), (20, 1050010451), (28, 750007465), (35, 600005972), (41, 512200220), (70, 300002986), (82, 256100110), (140, 150001493), (164, 128050055), (205, 102440044), (287, 73171460), (410, 51220022), (574, 36585730), (820, 25610011), (1148, 18292865), (1435, 14634292), (1693, 12404140), (2161, 9717820), (2870, 7317146), (3386, 6202070), (4322, 4858910), (5740, 3658573), (6772, 3101035), (8465, 2480828), (8644, 2429455), (10805, 1943564), (11851, 1772020), (15127, 1388260), (16930, 1240414), (21610, 971782), (23702, 886010), (30254, 694130), (33860, 620207), (43220, 485891), (47404, 443005), (59255, 354404), (60508, 347065), (69413, 302540), (75635, 277652), (88601, 237020), (118510, 177202), (138826, 151270)]