20904885

素因数分解:

$3^4\times 5^1\times {\mathrm{71}}^1\times {\mathrm{727}}^1$

素因数の和:815

約数の個数: 40

約数和(自身を含む): 38054016

約数和(自身を除く): 17149131

約数列:

[1, 3, 5, 9, 15, 27, 45, 71, 81, 135, 213, 355, 405, 639, 727, 1065, 1917, 2181, 3195, 3635, 5751, 6543, 9585, 10905, 19629, 28755, 32715, 51617, 58887, 98145, 154851, 258085, 294435, 464553, 774255, 1393659, 2322765, 4180977, 6968295, 20904885]

約数ペア:

[(1, 20904885), (3, 6968295), (5, 4180977), (9, 2322765), (15, 1393659), (27, 774255), (45, 464553), (71, 294435), (81, 258085), (135, 154851), (213, 98145), (355, 58887), (405, 51617), (639, 32715), (727, 28755), (1065, 19629), (1917, 10905), (2181, 9585), (3195, 6543), (3635, 5751)]