20187880

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{101}}^1\times {\mathrm{263}}^1$

素因数の和:394

約数の個数: 64

約数和(自身を含む): 48470400

約数和(自身を除く): 28282520

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 76, 95, 101, 152, 190, 202, 263, 380, 404, 505, 526, 760, 808, 1010, 1052, 1315, 1919, 2020, 2104, 2630, 3838, 4040, 4997, 5260, 7676, 9595, 9994, 10520, 15352, 19190, 19988, 24985, 26563, 38380, 39976, 49970, 53126, 76760, 99940, 106252, 132815, 199880, 212504, 265630, 504697, 531260, 1009394, 1062520, 2018788, 2523485, 4037576, 5046970, 10093940, 20187880]

約数ペア:

[(1, 20187880), (2, 10093940), (4, 5046970), (5, 4037576), (8, 2523485), (10, 2018788), (19, 1062520), (20, 1009394), (38, 531260), (40, 504697), (76, 265630), (95, 212504), (101, 199880), (152, 132815), (190, 106252), (202, 99940), (263, 76760), (380, 53126), (404, 49970), (505, 39976), (526, 38380), (760, 26563), (808, 24985), (1010, 19988), (1052, 19190), (1315, 15352), (1919, 10520), (2020, 9994), (2104, 9595), (2630, 7676), (3838, 5260), (4040, 4997)]