21019088

素因数分解:

$2^4\times {\mathrm{43}}^1\times {\mathrm{137}}^1\times {\mathrm{223}}^1$

素因数の和:411

約数の個数: 40

約数和(自身を含む): 42163968

約数和(自身を除く): 21144880

約数列:

[1, 2, 4, 8, 16, 43, 86, 137, 172, 223, 274, 344, 446, 548, 688, 892, 1096, 1784, 2192, 3568, 5891, 9589, 11782, 19178, 23564, 30551, 38356, 47128, 61102, 76712, 94256, 122204, 153424, 244408, 488816, 1313693, 2627386, 5254772, 10509544, 21019088]

約数ペア:

[(1, 21019088), (2, 10509544), (4, 5254772), (8, 2627386), (16, 1313693), (43, 488816), (86, 244408), (137, 153424), (172, 122204), (223, 94256), (274, 76712), (344, 61102), (446, 47128), (548, 38356), (688, 30551), (892, 23564), (1096, 19178), (1784, 11782), (2192, 9589), (3568, 5891)]