20997823

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{163}}^1\times {\mathrm{239}}^1$

素因数の和:427

約数の個数: 24

約数和(自身を含む): 26922240

約数和(自身を除く): 5924417

約数列:

[1, 7, 11, 49, 77, 163, 239, 539, 1141, 1673, 1793, 2629, 7987, 11711, 12551, 18403, 38957, 87857, 128821, 272699, 428527, 1908893, 2999689, 20997823]

約数ペア:

[(1, 20997823), (7, 2999689), (11, 1908893), (49, 428527), (77, 272699), (163, 128821), (239, 87857), (539, 38957), (1141, 18403), (1673, 12551), (1793, 11711), (2629, 7987)]