20156975

素因数分解:

$5^2\times {\mathrm{31}}^2\times {\mathrm{839}}^1$

素因数の和:911

約数の個数: 18

約数和(自身を含む): 25857720

約数和(自身を除く): 5700745

約数列:

[1, 5, 25, 31, 155, 775, 839, 961, 4195, 4805, 20975, 24025, 26009, 130045, 650225, 806279, 4031395, 20156975]

約数ペア:

[(1, 20156975), (5, 4031395), (25, 806279), (31, 650225), (155, 130045), (775, 26009), (839, 24025), (961, 20975), (4195, 4805)]