20680891

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{61}}^1$

素因数の和:140

約数の個数: 48

約数和(自身を含む): 29007072

約数和(自身を除く): 8326181

約数列:

[1, 7, 11, 17, 37, 49, 61, 77, 119, 187, 259, 407, 427, 539, 629, 671, 833, 1037, 1309, 1813, 2257, 2849, 2989, 4403, 4697, 6919, 7259, 9163, 11407, 15799, 19943, 24827, 30821, 32879, 38369, 48433, 50813, 79849, 110593, 173789, 268583, 339031, 422059, 558943, 1216523, 1880081, 2954413, 20680891]

約数ペア:

[(1, 20680891), (7, 2954413), (11, 1880081), (17, 1216523), (37, 558943), (49, 422059), (61, 339031), (77, 268583), (119, 173789), (187, 110593), (259, 79849), (407, 50813), (427, 48433), (539, 38369), (629, 32879), (671, 30821), (833, 24827), (1037, 19943), (1309, 15799), (1813, 11407), (2257, 9163), (2849, 7259), (2989, 6919), (4403, 4697)]