20667855

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^2\times {\mathrm{31}}^1\times {\mathrm{263}}^1$

素因数の和:328

約数の個数: 48

約数和(自身を含む): 37103616

約数和(自身を除く): 16435761

約数列:

[1, 3, 5, 13, 15, 31, 39, 65, 93, 155, 169, 195, 263, 403, 465, 507, 789, 845, 1209, 1315, 2015, 2535, 3419, 3945, 5239, 6045, 8153, 10257, 15717, 17095, 24459, 26195, 40765, 44447, 51285, 78585, 105989, 122295, 133341, 222235, 317967, 529945, 666705, 1377857, 1589835, 4133571, 6889285, 20667855]

約数ペア:

[(1, 20667855), (3, 6889285), (5, 4133571), (13, 1589835), (15, 1377857), (31, 666705), (39, 529945), (65, 317967), (93, 222235), (155, 133341), (169, 122295), (195, 105989), (263, 78585), (403, 51285), (465, 44447), (507, 40765), (789, 26195), (845, 24459), (1209, 17095), (1315, 15717), (2015, 10257), (2535, 8153), (3419, 6045), (3945, 5239)]