21988040

素因数分解:

$2^3\times 5^1\times {\mathrm{549701}}^1$

素因数の和:549712

約数の個数: 16

約数和(自身を含む): 49473180

約数和(自身を除く): 27485140

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 549701, 1099402, 2198804, 2748505, 4397608, 5497010, 10994020, 21988040]

約数ペア:

[(1, 21988040), (2, 10994020), (4, 5497010), (5, 4397608), (8, 2748505), (10, 2198804), (20, 1099402), (40, 549701)]