21499828

素因数分解:

$2^2\times 7^2\times {\mathrm{43}}^1\times {\mathrm{2551}}^1$

素因数の和:2612

約数の個数: 36

約数和(自身を含む): 44802912

約数和(自身を除く): 23303084

約数列:

[1, 2, 4, 7, 14, 28, 43, 49, 86, 98, 172, 196, 301, 602, 1204, 2107, 2551, 4214, 5102, 8428, 10204, 17857, 35714, 71428, 109693, 124999, 219386, 249998, 438772, 499996, 767851, 1535702, 3071404, 5374957, 10749914, 21499828]

約数ペア:

[(1, 21499828), (2, 10749914), (4, 5374957), (7, 3071404), (14, 1535702), (28, 767851), (43, 499996), (49, 438772), (86, 249998), (98, 219386), (172, 124999), (196, 109693), (301, 71428), (602, 35714), (1204, 17857), (2107, 10204), (2551, 8428), (4214, 5102)]