21811960

素因数分解:

$2^3\times 5^1\times {\mathrm{101}}^1\times {\mathrm{5399}}^1$

素因数の和:5511

約数の個数: 32

約数和(自身を含む): 49572000

約数和(自身を除く): 27760040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 101, 202, 404, 505, 808, 1010, 2020, 4040, 5399, 10798, 21596, 26995, 43192, 53990, 107980, 215960, 545299, 1090598, 2181196, 2726495, 4362392, 5452990, 10905980, 21811960]

約数ペア:

[(1, 21811960), (2, 10905980), (4, 5452990), (5, 4362392), (8, 2726495), (10, 2181196), (20, 1090598), (40, 545299), (101, 215960), (202, 107980), (404, 53990), (505, 43192), (808, 26995), (1010, 21596), (2020, 10798), (4040, 5399)]