21056541

素因数分解:

$3^1\times {\mathrm{11}}^2\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{71}}^1$

素因数の和:158

約数の個数: 48

約数和(自身を含む): 33707520

約数和(自身を除く): 12650979

約数列:

[1, 3, 11, 19, 33, 43, 57, 71, 121, 129, 209, 213, 363, 473, 627, 781, 817, 1349, 1419, 2299, 2343, 2451, 3053, 4047, 5203, 6897, 8591, 8987, 9159, 14839, 15609, 25773, 26961, 33583, 44517, 58007, 98857, 100749, 163229, 174021, 296571, 369413, 489687, 638077, 1108239, 1914231, 7018847, 21056541]

約数ペア:

[(1, 21056541), (3, 7018847), (11, 1914231), (19, 1108239), (33, 638077), (43, 489687), (57, 369413), (71, 296571), (121, 174021), (129, 163229), (209, 100749), (213, 98857), (363, 58007), (473, 44517), (627, 33583), (781, 26961), (817, 25773), (1349, 15609), (1419, 14839), (2299, 9159), (2343, 8987), (2451, 8591), (3053, 6897), (4047, 5203)]