20390840

素因数分解:

$2^3\times 5^1\times {\mathrm{709}}^1\times {\mathrm{719}}^1$

素因数の和:1439

約数の個数: 32

約数和(自身を含む): 46008000

約数和(自身を除く): 25617160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 709, 719, 1418, 1438, 2836, 2876, 3545, 3595, 5672, 5752, 7090, 7190, 14180, 14380, 28360, 28760, 509771, 1019542, 2039084, 2548855, 4078168, 5097710, 10195420, 20390840]

約数ペア:

[(1, 20390840), (2, 10195420), (4, 5097710), (5, 4078168), (8, 2548855), (10, 2039084), (20, 1019542), (40, 509771), (709, 28760), (719, 28360), (1418, 14380), (1438, 14180), (2836, 7190), (2876, 7090), (3545, 5752), (3595, 5672)]