20648440

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{101}}^1\times {\mathrm{269}}^1$

素因数の和:400

約数の個数: 64

約数和(自身を含む): 49572000

約数和(自身を除く): 28923560

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 76, 95, 101, 152, 190, 202, 269, 380, 404, 505, 538, 760, 808, 1010, 1076, 1345, 1919, 2020, 2152, 2690, 3838, 4040, 5111, 5380, 7676, 9595, 10222, 10760, 15352, 19190, 20444, 25555, 27169, 38380, 40888, 51110, 54338, 76760, 102220, 108676, 135845, 204440, 217352, 271690, 516211, 543380, 1032422, 1086760, 2064844, 2581055, 4129688, 5162110, 10324220, 20648440]

約数ペア:

[(1, 20648440), (2, 10324220), (4, 5162110), (5, 4129688), (8, 2581055), (10, 2064844), (19, 1086760), (20, 1032422), (38, 543380), (40, 516211), (76, 271690), (95, 217352), (101, 204440), (152, 135845), (190, 108676), (202, 102220), (269, 76760), (380, 54338), (404, 51110), (505, 40888), (538, 38380), (760, 27169), (808, 25555), (1010, 20444), (1076, 19190), (1345, 15352), (1919, 10760), (2020, 10222), (2152, 9595), (2690, 7676), (3838, 5380), (4040, 5111)]