81643261

素因数分解:

$7^3\times {\mathrm{23}}^1\times {\mathrm{79}}^1\times {\mathrm{131}}^1$

素因数の和:254

約数の個数: 32

約数和(自身を含む): 101376000

約数和(自身を除く): 19732739

約数列:

[1, 7, 23, 49, 79, 131, 161, 343, 553, 917, 1127, 1817, 3013, 3871, 6419, 7889, 10349, 12719, 21091, 27097, 44933, 72443, 89033, 147637, 238027, 507101, 623231, 1033459, 1666189, 3549707, 11663323, 81643261]

約数ペア:

[(1, 81643261), (7, 11663323), (23, 3549707), (49, 1666189), (79, 1033459), (131, 623231), (161, 507101), (343, 238027), (553, 147637), (917, 89033), (1127, 72443), (1817, 44933), (3013, 27097), (3871, 21091), (6419, 12719), (7889, 10349)]