21809116

素因数分解:

$2^2\times 7^2\times {\mathrm{111271}}^1$

素因数の和:111289

約数の個数: 18

約数和(自身を含む): 44397528

約数和(自身を除く): 22588412

約数列:

[1, 2, 4, 7, 14, 28, 49, 98, 196, 111271, 222542, 445084, 778897, 1557794, 3115588, 5452279, 10904558, 21809116]

約数ペア:

[(1, 21809116), (2, 10904558), (4, 5452279), (7, 3115588), (14, 1557794), (28, 778897), (49, 445084), (98, 222542), (196, 111271)]