20858999

素因数分解:

$7^1\times {\mathrm{23}}^2\times {\mathrm{43}}^1\times {\mathrm{131}}^1$

素因数の和:227

約数の個数: 24

約数和(自身を含む): 25694592

約数和(自身を除く): 4835593

約数列:

[1, 7, 23, 43, 131, 161, 301, 529, 917, 989, 3013, 3703, 5633, 6923, 21091, 22747, 39431, 69299, 129559, 159229, 485093, 906913, 2979857, 20858999]

約数ペア:

[(1, 20858999), (7, 2979857), (23, 906913), (43, 485093), (131, 159229), (161, 129559), (301, 69299), (529, 39431), (917, 22747), (989, 21091), (3013, 6923), (3703, 5633)]