21653639

素因数分解:

$7^2\times {\mathrm{43}}^2\times {\mathrm{239}}^1$

素因数の和:339

約数の個数: 18

約数和(自身を含む): 25896240

約数和(自身を除く): 4242601

約数列:

[1, 7, 43, 49, 239, 301, 1673, 1849, 2107, 10277, 11711, 12943, 71939, 90601, 441911, 503573, 3093377, 21653639]

約数ペア:

[(1, 21653639), (7, 3093377), (43, 503573), (49, 441911), (239, 90601), (301, 71939), (1673, 12943), (1849, 11711), (2107, 10277)]