21025719

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{31}}^2$

素因数の和:109

約数の個数: 72

約数和(自身を含む): 39036816

約数和(自身を除く): 18011097

約数列:

[1, 3, 9, 11, 13, 17, 31, 33, 39, 51, 93, 99, 117, 143, 153, 187, 221, 279, 341, 403, 429, 527, 561, 663, 961, 1023, 1209, 1287, 1581, 1683, 1989, 2431, 2883, 3069, 3627, 4433, 4743, 5797, 6851, 7293, 8649, 10571, 12493, 13299, 16337, 17391, 20553, 21879, 31713, 37479, 39897, 49011, 52173, 61659, 75361, 95139, 112437, 137423, 147033, 179707, 212381, 226083, 412269, 539121, 637143, 678249, 1236807, 1617363, 1911429, 2336191, 7008573, 21025719]

約数ペア:

[(1, 21025719), (3, 7008573), (9, 2336191), (11, 1911429), (13, 1617363), (17, 1236807), (31, 678249), (33, 637143), (39, 539121), (51, 412269), (93, 226083), (99, 212381), (117, 179707), (143, 147033), (153, 137423), (187, 112437), (221, 95139), (279, 75361), (341, 61659), (403, 52173), (429, 49011), (527, 39897), (561, 37479), (663, 31713), (961, 21879), (1023, 20553), (1209, 17391), (1287, 16337), (1581, 13299), (1683, 12493), (1989, 10571), (2431, 8649), (2883, 7293), (3069, 6851), (3627, 5797), (4433, 4743)]