19918157

素因数分解:

$7^2\times {\mathrm{29}}^1\times {\mathrm{107}}^1\times {\mathrm{131}}^1$

素因数の和:281

約数の個数: 24

約数和(自身を含む): 24377760

約数和(自身を除く): 4459603

約数列:

[1, 7, 29, 49, 107, 131, 203, 749, 917, 1421, 3103, 3799, 5243, 6419, 14017, 21721, 26593, 98119, 152047, 186151, 406493, 686833, 2845451, 19918157]

約数ペア:

[(1, 19918157), (7, 2845451), (29, 686833), (49, 406493), (107, 186151), (131, 152047), (203, 98119), (749, 26593), (917, 21721), (1421, 14017), (3103, 6419), (3799, 5243)]