21173716

素因数分解:

$2^2\times {\mathrm{43}}^1\times {\mathrm{257}}^1\times {\mathrm{479}}^1$

素因数の和:783

約数の個数: 24

約数和(自身を含む): 38142720

約数和(自身を除く): 16969004

約数列:

[1, 2, 4, 43, 86, 172, 257, 479, 514, 958, 1028, 1916, 11051, 20597, 22102, 41194, 44204, 82388, 123103, 246206, 492412, 5293429, 10586858, 21173716]

約数ペア:

[(1, 21173716), (2, 10586858), (4, 5293429), (43, 492412), (86, 246206), (172, 123103), (257, 82388), (479, 44204), (514, 41194), (958, 22102), (1028, 20597), (1916, 11051)]