21158781

素因数分解:

$3^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{71}}^1\times {\mathrm{617}}^1$

素因数の和:721

約数の個数: 32

約数和(自身を含む): 34172928

約数和(自身を除く): 13014147

約数列:

[1, 3, 7, 21, 23, 69, 71, 161, 213, 483, 497, 617, 1491, 1633, 1851, 4319, 4899, 11431, 12957, 14191, 34293, 42573, 43807, 99337, 131421, 298011, 306649, 919947, 1007561, 3022683, 7052927, 21158781]

約数ペア:

[(1, 21158781), (3, 7052927), (7, 3022683), (21, 1007561), (23, 919947), (69, 306649), (71, 298011), (161, 131421), (213, 99337), (483, 43807), (497, 42573), (617, 34293), (1491, 14191), (1633, 12957), (1851, 11431), (4319, 4899)]