21031280

素因数分解:

$2^4\times 5^1\times {\mathrm{151}}^1\times {\mathrm{1741}}^1$

素因数の和:1905

約数の個数: 40

約数和(自身を含む): 49249824

約数和(自身を除く): 28218544

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 151, 302, 604, 755, 1208, 1510, 1741, 2416, 3020, 3482, 6040, 6964, 8705, 12080, 13928, 17410, 27856, 34820, 69640, 139280, 262891, 525782, 1051564, 1314455, 2103128, 2628910, 4206256, 5257820, 10515640, 21031280]

約数ペア:

[(1, 21031280), (2, 10515640), (4, 5257820), (5, 4206256), (8, 2628910), (10, 2103128), (16, 1314455), (20, 1051564), (40, 525782), (80, 262891), (151, 139280), (302, 69640), (604, 34820), (755, 27856), (1208, 17410), (1510, 13928), (1741, 12080), (2416, 8705), (3020, 6964), (3482, 6040)]