21808087

素因数分解:

$7^2\times {\mathrm{29}}^1\times {\mathrm{103}}^1\times {\mathrm{149}}^1$

素因数の和:295

約数の個数: 24

約数和(自身を含む): 26676000

約数和(自身を除く): 4867913

約数列:

[1, 7, 29, 49, 103, 149, 203, 721, 1043, 1421, 2987, 4321, 5047, 7301, 15347, 20909, 30247, 107429, 146363, 211729, 445063, 752003, 3115441, 21808087]

約数ペア:

[(1, 21808087), (7, 3115441), (29, 752003), (49, 445063), (103, 211729), (149, 146363), (203, 107429), (721, 30247), (1043, 20909), (1421, 15347), (2987, 7301), (4321, 5047)]