217940

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{641}}^1$

素因数の和:667

約数の個数: 24

約数和(自身を含む): 485352

約数和(自身を除く): 267412

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 340, 641, 1282, 2564, 3205, 6410, 10897, 12820, 21794, 43588, 54485, 108970, 217940]

約数ペア:

[(1, 217940), (2, 108970), (4, 54485), (5, 43588), (10, 21794), (17, 12820), (20, 10897), (34, 6410), (68, 3205), (85, 2564), (170, 1282), (340, 641)]