20717445

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{71}}^1\times {\mathrm{397}}^1$

素因数の和:490

約数の個数: 48

約数和(自身を含む): 39201408

約数和(自身を除く): 18483963

約数列:

[1, 3, 5, 7, 15, 21, 35, 49, 71, 105, 147, 213, 245, 355, 397, 497, 735, 1065, 1191, 1491, 1985, 2485, 2779, 3479, 5955, 7455, 8337, 10437, 13895, 17395, 19453, 28187, 41685, 52185, 58359, 84561, 97265, 140935, 197309, 291795, 422805, 591927, 986545, 1381163, 2959635, 4143489, 6905815, 20717445]

約数ペア:

[(1, 20717445), (3, 6905815), (5, 4143489), (7, 2959635), (15, 1381163), (21, 986545), (35, 591927), (49, 422805), (71, 291795), (105, 197309), (147, 140935), (213, 97265), (245, 84561), (355, 58359), (397, 52185), (497, 41685), (735, 28187), (1065, 19453), (1191, 17395), (1491, 13895), (1985, 10437), (2485, 8337), (2779, 7455), (3479, 5955)]