221521257

素因数分解:

$3^3\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{311}}^1$

素因数の和:411

約数の個数: 64

約数和(自身を含む): 364216320

約数和(自身を除く): 142695063

約数列:

[1, 3, 9, 23, 27, 31, 37, 69, 93, 111, 207, 279, 311, 333, 621, 713, 837, 851, 933, 999, 1147, 2139, 2553, 2799, 3441, 6417, 7153, 7659, 8397, 9641, 10323, 11507, 19251, 21459, 22977, 26381, 28923, 30969, 34521, 64377, 79143, 86769, 103563, 193131, 221743, 237429, 260307, 264661, 310689, 356717, 665229, 712287, 793983, 1070151, 1995687, 2381949, 3210453, 5987061, 7145847, 8204491, 9631359, 24613473, 73840419, 221521257]

約数ペア:

[(1, 221521257), (3, 73840419), (9, 24613473), (23, 9631359), (27, 8204491), (31, 7145847), (37, 5987061), (69, 3210453), (93, 2381949), (111, 1995687), (207, 1070151), (279, 793983), (311, 712287), (333, 665229), (621, 356717), (713, 310689), (837, 264661), (851, 260307), (933, 237429), (999, 221743), (1147, 193131), (2139, 103563), (2553, 86769), (2799, 79143), (3441, 64377), (6417, 34521), (7153, 30969), (7659, 28923), (8397, 26381), (9641, 22977), (10323, 21459), (11507, 19251)]