639980

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{2909}}^1$

素因数の和:2929

約数の個数: 24

約数和(自身を含む): 1466640

約数和(自身を除く): 826660

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 2909, 5818, 11636, 14545, 29090, 31999, 58180, 63998, 127996, 159995, 319990, 639980]

約数ペア:

[(1, 639980), (2, 319990), (4, 159995), (5, 127996), (10, 63998), (11, 58180), (20, 31999), (22, 29090), (44, 14545), (55, 11636), (110, 5818), (220, 2909)]