21091917

素因数分解:

$3^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{131}}^1$

素因数の和:210

約数の個数: 64

約数和(自身を含む): 38320128

約数和(自身を除く): 17228211

約数列:

[1, 3, 7, 11, 17, 21, 33, 41, 51, 77, 119, 123, 131, 187, 231, 287, 357, 393, 451, 561, 697, 861, 917, 1309, 1353, 1441, 2091, 2227, 2751, 3157, 3927, 4323, 4879, 5371, 6681, 7667, 9471, 10087, 14637, 15589, 16113, 23001, 24497, 30261, 37597, 46767, 53669, 59081, 73491, 91307, 112791, 161007, 171479, 177243, 273921, 413567, 514437, 639149, 1004377, 1240701, 1917447, 3013131, 7030639, 21091917]

約数ペア:

[(1, 21091917), (3, 7030639), (7, 3013131), (11, 1917447), (17, 1240701), (21, 1004377), (33, 639149), (41, 514437), (51, 413567), (77, 273921), (119, 177243), (123, 171479), (131, 161007), (187, 112791), (231, 91307), (287, 73491), (357, 59081), (393, 53669), (451, 46767), (561, 37597), (697, 30261), (861, 24497), (917, 23001), (1309, 16113), (1353, 15589), (1441, 14637), (2091, 10087), (2227, 9471), (2751, 7667), (3157, 6681), (3927, 5371), (4323, 4879)]