21007899

素因数分解:

$3^2\times {\mathrm{11}}^2\times {\mathrm{101}}^1\times {\mathrm{191}}^1$

素因数の和:320

約数の個数: 36

約数和(自身を含む): 33860736

約数和(自身を除く): 12852837

約数列:

[1, 3, 9, 11, 33, 99, 101, 121, 191, 303, 363, 573, 909, 1089, 1111, 1719, 2101, 3333, 6303, 9999, 12221, 18909, 19291, 23111, 36663, 57873, 69333, 109989, 173619, 207999, 212201, 636603, 1909809, 2334211, 7002633, 21007899]

約数ペア:

[(1, 21007899), (3, 7002633), (9, 2334211), (11, 1909809), (33, 636603), (99, 212201), (101, 207999), (121, 173619), (191, 109989), (303, 69333), (363, 57873), (573, 36663), (909, 23111), (1089, 19291), (1111, 18909), (1719, 12221), (2101, 9999), (3333, 6303)]