20178739

素因数分解:

$7^2\times {\mathrm{43}}^1\times {\mathrm{61}}^1\times {\mathrm{157}}^1$

素因数の和:275

約数の個数: 24

約数和(自身を含む): 24568368

約数和(自身を除く): 4389629

約数列:

[1, 7, 43, 49, 61, 157, 301, 427, 1099, 2107, 2623, 2989, 6751, 7693, 9577, 18361, 47257, 67039, 128527, 330799, 411811, 469273, 2882677, 20178739]

約数ペア:

[(1, 20178739), (7, 2882677), (43, 469273), (49, 411811), (61, 330799), (157, 128527), (301, 67039), (427, 47257), (1099, 18361), (2107, 9577), (2623, 7693), (2989, 6751)]