21072805

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{113}}^1\times {\mathrm{151}}^1$

素因数の和:301

約数の個数: 32

約数和(自身を含む): 29111040

約数和(自身を除く): 8038235

約数列:

[1, 5, 13, 19, 65, 95, 113, 151, 247, 565, 755, 1235, 1469, 1963, 2147, 2869, 7345, 9815, 10735, 14345, 17063, 27911, 37297, 85315, 139555, 186485, 221819, 324197, 1109095, 1620985, 4214561, 21072805]

約数ペア:

[(1, 21072805), (5, 4214561), (13, 1620985), (19, 1109095), (65, 324197), (95, 221819), (113, 186485), (151, 139555), (247, 85315), (565, 37297), (755, 27911), (1235, 17063), (1469, 14345), (1963, 10735), (2147, 9815), (2869, 7345)]