640424

素因数分解:

$2^3\times {\mathrm{17}}^2\times {\mathrm{277}}^1$

素因数の和:317

約数の個数: 24

約数和(自身を含む): 1280190

約数和(自身を除く): 639766

約数列:

[1, 2, 4, 8, 17, 34, 68, 136, 277, 289, 554, 578, 1108, 1156, 2216, 2312, 4709, 9418, 18836, 37672, 80053, 160106, 320212, 640424]

約数ペア:

[(1, 640424), (2, 320212), (4, 160106), (8, 80053), (17, 37672), (34, 18836), (68, 9418), (136, 4709), (277, 2312), (289, 2216), (554, 1156), (578, 1108)]