20918755

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{1721}}^1$

素因数の和:1767

約数の個数: 32

約数和(自身を含む): 31243968

約数和(自身を除く): 10325213

約数列:

[1, 5, 11, 13, 17, 55, 65, 85, 143, 187, 221, 715, 935, 1105, 1721, 2431, 8605, 12155, 18931, 22373, 29257, 94655, 111865, 146285, 246103, 321827, 380341, 1230515, 1609135, 1901705, 4183751, 20918755]

約数ペア:

[(1, 20918755), (5, 4183751), (11, 1901705), (13, 1609135), (17, 1230515), (55, 380341), (65, 321827), (85, 246103), (143, 146285), (187, 111865), (221, 94655), (715, 29257), (935, 22373), (1105, 18931), (1721, 12155), (2431, 8605)]