19660221

素因数分解:

$3^2\times 7^2\times {\mathrm{109}}^1\times {\mathrm{409}}^1$

素因数の和:538

約数の個数: 36

約数和(自身を含む): 33419100

約数和(自身を除く): 13758879

約数列:

[1, 3, 7, 9, 21, 49, 63, 109, 147, 327, 409, 441, 763, 981, 1227, 2289, 2863, 3681, 5341, 6867, 8589, 16023, 20041, 25767, 44581, 48069, 60123, 133743, 180369, 312067, 401229, 936201, 2184469, 2808603, 6553407, 19660221]

約数ペア:

[(1, 19660221), (3, 6553407), (7, 2808603), (9, 2184469), (21, 936201), (49, 401229), (63, 312067), (109, 180369), (147, 133743), (327, 60123), (409, 48069), (441, 44581), (763, 25767), (981, 20041), (1227, 16023), (2289, 8589), (2863, 6867), (3681, 5341)]