21273105

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{103}}^1\times {\mathrm{281}}^1$

素因数の和:406

約数の個数: 48

約数和(自身を含む): 40120704

約数和(自身を除く): 18847599

約数列:

[1, 3, 5, 7, 15, 21, 35, 49, 103, 105, 147, 245, 281, 309, 515, 721, 735, 843, 1405, 1545, 1967, 2163, 3605, 4215, 5047, 5901, 9835, 10815, 13769, 15141, 25235, 28943, 29505, 41307, 68845, 75705, 86829, 144715, 202601, 206535, 434145, 607803, 1013005, 1418207, 3039015, 4254621, 7091035, 21273105]

約数ペア:

[(1, 21273105), (3, 7091035), (5, 4254621), (7, 3039015), (15, 1418207), (21, 1013005), (35, 607803), (49, 434145), (103, 206535), (105, 202601), (147, 144715), (245, 86829), (281, 75705), (309, 68845), (515, 41307), (721, 29505), (735, 28943), (843, 25235), (1405, 15141), (1545, 13769), (1967, 10815), (2163, 9835), (3605, 5901), (4215, 5047)]