21039255

素因数分解:

$3^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{83}}^1\times {\mathrm{131}}^1$

素因数の和:268

約数の個数: 48

約数和(自身を含む): 38054016

約数和(自身を除く): 17014761

約数列:

[1, 3, 5, 9, 15, 43, 45, 83, 129, 131, 215, 249, 387, 393, 415, 645, 655, 747, 1179, 1245, 1935, 1965, 3569, 3735, 5633, 5895, 10707, 10873, 16899, 17845, 28165, 32121, 32619, 50697, 53535, 54365, 84495, 97857, 160605, 163095, 253485, 467539, 489285, 1402617, 2337695, 4207851, 7013085, 21039255]

約数ペア:

[(1, 21039255), (3, 7013085), (5, 4207851), (9, 2337695), (15, 1402617), (43, 489285), (45, 467539), (83, 253485), (129, 163095), (131, 160605), (215, 97857), (249, 84495), (387, 54365), (393, 53535), (415, 50697), (645, 32619), (655, 32121), (747, 28165), (1179, 17845), (1245, 16899), (1935, 10873), (1965, 10707), (3569, 5895), (3735, 5633)]