20420211

素因数分解:

$3^1\times 7^2\times {\mathrm{53}}^1\times {\mathrm{2621}}^1$

素因数の和:2691

約数の個数: 24

約数和(自身を含む): 32282064

約数和(自身を除く): 11861853

約数列:

[1, 3, 7, 21, 49, 53, 147, 159, 371, 1113, 2597, 2621, 7791, 7863, 18347, 55041, 128429, 138913, 385287, 416739, 972391, 2917173, 6806737, 20420211]

約数ペア:

[(1, 20420211), (3, 6806737), (7, 2917173), (21, 972391), (49, 416739), (53, 385287), (147, 138913), (159, 128429), (371, 55041), (1113, 18347), (2597, 7863), (2621, 7791)]