21785517

素因数分解:

$3^4\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{1217}}^1$

素因数の和:1259

約数の個数: 40

約数和(自身を含む): 37139256

約数和(自身を除く): 15353739

約数列:

[1, 3, 9, 13, 17, 27, 39, 51, 81, 117, 153, 221, 351, 459, 663, 1053, 1217, 1377, 1989, 3651, 5967, 10953, 15821, 17901, 20689, 32859, 47463, 62067, 98577, 142389, 186201, 268957, 427167, 558603, 806871, 1281501, 1675809, 2420613, 7261839, 21785517]

約数ペア:

[(1, 21785517), (3, 7261839), (9, 2420613), (13, 1675809), (17, 1281501), (27, 806871), (39, 558603), (51, 427167), (81, 268957), (117, 186201), (153, 142389), (221, 98577), (351, 62067), (459, 47463), (663, 32859), (1053, 20689), (1217, 17901), (1377, 15821), (1989, 10953), (3651, 5967)]