21257409

素因数分解:

$3^1\times {\mathrm{19}}^1\times {\mathrm{139}}^1\times {\mathrm{2683}}^1$

素因数の和:2844

約数の個数: 16

約数和(自身を含む): 30060800

約数和(自身を除く): 8803391

約数列:

[1, 3, 19, 57, 139, 417, 2641, 2683, 7923, 8049, 50977, 152931, 372937, 1118811, 7085803, 21257409]

約数ペア:

[(1, 21257409), (3, 7085803), (19, 1118811), (57, 372937), (139, 152931), (417, 50977), (2641, 8049), (2683, 7923)]