20390293

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{421}}^1$

素因数の和:493

約数の個数: 32

約数和(自身を含む): 27710208

約数和(自身を除く): 7319915

約数列:

[1, 7, 11, 17, 37, 77, 119, 187, 259, 407, 421, 629, 1309, 2849, 2947, 4403, 4631, 6919, 7157, 15577, 32417, 48433, 50099, 78727, 109039, 171347, 264809, 551089, 1199429, 1853663, 2912899, 20390293]

約数ペア:

[(1, 20390293), (7, 2912899), (11, 1853663), (17, 1199429), (37, 551089), (77, 264809), (119, 171347), (187, 109039), (259, 78727), (407, 50099), (421, 48433), (629, 32417), (1309, 15577), (2849, 7157), (2947, 6919), (4403, 4631)]