20486991

素因数分解:

$3^1\times 7^1\times {\mathrm{53}}^1\times {\mathrm{79}}^1\times {\mathrm{233}}^1$

素因数の和:375

約数の個数: 32

約数和(自身を含む): 32348160

約数和(自身を除く): 11861169

約数列:

[1, 3, 7, 21, 53, 79, 159, 233, 237, 371, 553, 699, 1113, 1631, 1659, 4187, 4893, 12349, 12561, 18407, 29309, 37047, 55221, 86443, 87927, 128849, 259329, 386547, 975571, 2926713, 6828997, 20486991]

約数ペア:

[(1, 20486991), (3, 6828997), (7, 2926713), (21, 975571), (53, 386547), (79, 259329), (159, 128849), (233, 87927), (237, 86443), (371, 55221), (553, 37047), (699, 29309), (1113, 18407), (1631, 12561), (1659, 12349), (4187, 4893)]