21021741

素因数分解:

$3^3\times {\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{271}}^1$

素因数の和:323

約数の個数: 48

約数和(自身を含む): 35838720

約数和(自身を除く): 14816979

約数列:

[1, 3, 9, 13, 17, 27, 39, 51, 117, 153, 169, 221, 271, 351, 459, 507, 663, 813, 1521, 1989, 2439, 2873, 3523, 4563, 4607, 5967, 7317, 8619, 10569, 13821, 25857, 31707, 41463, 45799, 59891, 77571, 95121, 124389, 137397, 179673, 412191, 539019, 778583, 1236573, 1617057, 2335749, 7007247, 21021741]

約数ペア:

[(1, 21021741), (3, 7007247), (9, 2335749), (13, 1617057), (17, 1236573), (27, 778583), (39, 539019), (51, 412191), (117, 179673), (153, 137397), (169, 124389), (221, 95121), (271, 77571), (351, 59891), (459, 45799), (507, 41463), (663, 31707), (813, 25857), (1521, 13821), (1989, 10569), (2439, 8619), (2873, 7317), (3523, 5967), (4563, 4607)]