21297815

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^2\times {\mathrm{47}}^1\times {\mathrm{107}}^1$

素因数の和:188

約数の個数: 48

約数和(自身を含む): 33094656

約数和(自身を除く): 11796841

約数列:

[1, 5, 7, 11, 35, 47, 55, 77, 107, 121, 235, 329, 385, 517, 535, 605, 749, 847, 1177, 1645, 2585, 3619, 3745, 4235, 5029, 5687, 5885, 8239, 12947, 18095, 25145, 28435, 35203, 39809, 41195, 55319, 64735, 90629, 176015, 199045, 276595, 387233, 453145, 608509, 1936165, 3042545, 4259563, 21297815]

約数ペア:

[(1, 21297815), (5, 4259563), (7, 3042545), (11, 1936165), (35, 608509), (47, 453145), (55, 387233), (77, 276595), (107, 199045), (121, 176015), (235, 90629), (329, 64735), (385, 55319), (517, 41195), (535, 39809), (605, 35203), (749, 28435), (847, 25145), (1177, 18095), (1645, 12947), (2585, 8239), (3619, 5885), (3745, 5687), (4235, 5029)]