20428705

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{113}}^1\times {\mathrm{173}}^1$

素因数の和:321

約数の個数: 32

約数和(自身を含む): 28563840

約数和(自身を除く): 8135135

約数列:

[1, 5, 11, 19, 55, 95, 113, 173, 209, 565, 865, 1045, 1243, 1903, 2147, 3287, 6215, 9515, 10735, 16435, 19549, 23617, 36157, 97745, 118085, 180785, 215039, 371431, 1075195, 1857155, 4085741, 20428705]

約数ペア:

[(1, 20428705), (5, 4085741), (11, 1857155), (19, 1075195), (55, 371431), (95, 215039), (113, 180785), (173, 118085), (209, 97745), (565, 36157), (865, 23617), (1045, 19549), (1243, 16435), (1903, 10735), (2147, 9515), (3287, 6215)]