21387856

素因数分解:

$2^4\times 7^1\times {\mathrm{43}}^1\times {\mathrm{4441}}^1$

素因数の和:4499

約数の個数: 40

約数和(自身を含む): 48471104

約数和(自身を除く): 27083248

約数列:

[1, 2, 4, 7, 8, 14, 16, 28, 43, 56, 86, 112, 172, 301, 344, 602, 688, 1204, 2408, 4441, 4816, 8882, 17764, 31087, 35528, 62174, 71056, 124348, 190963, 248696, 381926, 497392, 763852, 1336741, 1527704, 2673482, 3055408, 5346964, 10693928, 21387856]

約数ペア:

[(1, 21387856), (2, 10693928), (4, 5346964), (7, 3055408), (8, 2673482), (14, 1527704), (16, 1336741), (28, 763852), (43, 497392), (56, 381926), (86, 248696), (112, 190963), (172, 124348), (301, 71056), (344, 62174), (602, 35528), (688, 31087), (1204, 17764), (2408, 8882), (4441, 4816)]