21130417

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{197}}^1\times {\mathrm{199}}^1$

素因数の和:421

約数の個数: 24

約数和(自身を含む): 27086400

約数和(自身を除く): 5955983

約数列:

[1, 7, 11, 49, 77, 197, 199, 539, 1379, 1393, 2167, 2189, 9653, 9751, 15169, 15323, 39203, 106183, 107261, 274421, 431233, 1920947, 3018631, 21130417]

約数ペア:

[(1, 21130417), (7, 3018631), (11, 1920947), (49, 431233), (77, 274421), (197, 107261), (199, 106183), (539, 39203), (1379, 15323), (1393, 15169), (2167, 9751), (2189, 9653)]