19901295

素因数分解:

$3^4\times 5^1\times {\mathrm{49139}}^1$

素因数の和:49156

約数の個数: 20

約数和(自身を含む): 35675640

約数和(自身を除く): 15774345

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 49139, 147417, 245695, 442251, 737085, 1326753, 2211255, 3980259, 6633765, 19901295]

約数ペア:

[(1, 19901295), (3, 6633765), (5, 3980259), (9, 2211255), (15, 1326753), (27, 737085), (45, 442251), (81, 245695), (135, 147417), (405, 49139)]