20391555

素因数分解:

$3^1\times 5^1\times {\mathrm{41}}^1\times {\mathrm{71}}^1\times {\mathrm{467}}^1$

素因数の和:587

約数の個数: 32

約数和(自身を含む): 33965568

約数和(自身を除く): 13574013

約数列:

[1, 3, 5, 15, 41, 71, 123, 205, 213, 355, 467, 615, 1065, 1401, 2335, 2911, 7005, 8733, 14555, 19147, 33157, 43665, 57441, 95735, 99471, 165785, 287205, 497355, 1359437, 4078311, 6797185, 20391555]

約数ペア:

[(1, 20391555), (3, 6797185), (5, 4078311), (15, 1359437), (41, 497355), (71, 287205), (123, 165785), (205, 99471), (213, 95735), (355, 57441), (467, 43665), (615, 33157), (1065, 19147), (1401, 14555), (2335, 8733), (2911, 7005)]