21306321

素因数分解:

$3^4\times {\mathrm{17}}^1\times {\mathrm{15473}}^1$

素因数の和:15502

約数の個数: 20

約数和(自身を含む): 33702372

約数和(自身を除く): 12396051

約数列:

[1, 3, 9, 17, 27, 51, 81, 153, 459, 1377, 15473, 46419, 139257, 263041, 417771, 789123, 1253313, 2367369, 7102107, 21306321]

約数ペア:

[(1, 21306321), (3, 7102107), (9, 2367369), (17, 1253313), (27, 789123), (51, 417771), (81, 263041), (153, 139257), (459, 46419), (1377, 15473)]