21009195

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{947}}^1$

素因数の和:1004

約数の個数: 48

約数和(自身を含む): 39929760

約数和(自身を除く): 18920565

約数列:

[1, 3, 5, 9, 15, 17, 29, 45, 51, 85, 87, 145, 153, 255, 261, 435, 493, 765, 947, 1305, 1479, 2465, 2841, 4437, 4735, 7395, 8523, 14205, 16099, 22185, 27463, 42615, 48297, 80495, 82389, 137315, 144891, 241485, 247167, 411945, 466871, 724455, 1235835, 1400613, 2334355, 4201839, 7003065, 21009195]

約数ペア:

[(1, 21009195), (3, 7003065), (5, 4201839), (9, 2334355), (15, 1400613), (17, 1235835), (29, 724455), (45, 466871), (51, 411945), (85, 247167), (87, 241485), (145, 144891), (153, 137315), (255, 82389), (261, 80495), (435, 48297), (493, 42615), (765, 27463), (947, 22185), (1305, 16099), (1479, 14205), (2465, 8523), (2841, 7395), (4437, 4735)]