21339280

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{101}}^1\times {\mathrm{139}}^1$

素因数の和:272

約数の個数: 80

約数和(自身を含む): 53121600

約数和(自身を除く): 31782320

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 76, 80, 95, 101, 139, 152, 190, 202, 278, 304, 380, 404, 505, 556, 695, 760, 808, 1010, 1112, 1390, 1520, 1616, 1919, 2020, 2224, 2641, 2780, 3838, 4040, 5282, 5560, 7676, 8080, 9595, 10564, 11120, 13205, 14039, 15352, 19190, 21128, 26410, 28078, 30704, 38380, 42256, 52820, 56156, 70195, 76760, 105640, 112312, 140390, 153520, 211280, 224624, 266741, 280780, 533482, 561560, 1066964, 1123120, 1333705, 2133928, 2667410, 4267856, 5334820, 10669640, 21339280]

約数ペア:

[(1, 21339280), (2, 10669640), (4, 5334820), (5, 4267856), (8, 2667410), (10, 2133928), (16, 1333705), (19, 1123120), (20, 1066964), (38, 561560), (40, 533482), (76, 280780), (80, 266741), (95, 224624), (101, 211280), (139, 153520), (152, 140390), (190, 112312), (202, 105640), (278, 76760), (304, 70195), (380, 56156), (404, 52820), (505, 42256), (556, 38380), (695, 30704), (760, 28078), (808, 26410), (1010, 21128), (1112, 19190), (1390, 15352), (1520, 14039), (1616, 13205), (1919, 11120), (2020, 10564), (2224, 9595), (2641, 8080), (2780, 7676), (3838, 5560), (4040, 5282)]