20447721

素因数分解:

$3^6\times 7^1\times {\mathrm{4007}}^1$

素因数の和:4032

約数の個数: 28

約数和(自身を含む): 35045952

約数和(自身を除く): 14598231

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 189, 243, 567, 729, 1701, 4007, 5103, 12021, 28049, 36063, 84147, 108189, 252441, 324567, 757323, 973701, 2271969, 2921103, 6815907, 20447721]

約数ペア:

[(1, 20447721), (3, 6815907), (7, 2921103), (9, 2271969), (21, 973701), (27, 757323), (63, 324567), (81, 252441), (189, 108189), (243, 84147), (567, 36063), (729, 28049), (1701, 12021), (4007, 5103)]