21290665

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{521}}^1\times {\mathrm{743}}^1$

素因数の和:1280

約数の個数: 16

約数和(自身を含む): 27962496

約数和(自身を除く): 6671831

約数列:

[1, 5, 11, 55, 521, 743, 2605, 3715, 5731, 8173, 28655, 40865, 387103, 1935515, 4258133, 21290665]

約数ペア:

[(1, 21290665), (5, 4258133), (11, 1935515), (55, 387103), (521, 40865), (743, 28655), (2605, 8173), (3715, 5731)]