20381800

素因数分解:

$2^3\times 5^2\times {\mathrm{101}}^1\times {\mathrm{1009}}^1$

素因数の和:1126

約数の個数: 48

約数和(自身を含む): 47904300

約数和(自身を除く): 27522500

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 101, 200, 202, 404, 505, 808, 1009, 1010, 2018, 2020, 2525, 4036, 4040, 5045, 5050, 8072, 10090, 10100, 20180, 20200, 25225, 40360, 50450, 100900, 101909, 201800, 203818, 407636, 509545, 815272, 1019090, 2038180, 2547725, 4076360, 5095450, 10190900, 20381800]

約数ペア:

[(1, 20381800), (2, 10190900), (4, 5095450), (5, 4076360), (8, 2547725), (10, 2038180), (20, 1019090), (25, 815272), (40, 509545), (50, 407636), (100, 203818), (101, 201800), (200, 101909), (202, 100900), (404, 50450), (505, 40360), (808, 25225), (1009, 20200), (1010, 20180), (2018, 10100), (2020, 10090), (2525, 8072), (4036, 5050), (4040, 5045)]