20990000

素因数分解:

$2^4\times 5^4\times {\mathrm{2099}}^1$

素因数の和:2127

約数の個数: 50

約数和(自身を含む): 50843100

約数和(自身を除く): 29853100

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 125, 200, 250, 400, 500, 625, 1000, 1250, 2000, 2099, 2500, 4198, 5000, 8396, 10000, 10495, 16792, 20990, 33584, 41980, 52475, 83960, 104950, 167920, 209900, 262375, 419800, 524750, 839600, 1049500, 1311875, 2099000, 2623750, 4198000, 5247500, 10495000, 20990000]

約数ペア:

[(1, 20990000), (2, 10495000), (4, 5247500), (5, 4198000), (8, 2623750), (10, 2099000), (16, 1311875), (20, 1049500), (25, 839600), (40, 524750), (50, 419800), (80, 262375), (100, 209900), (125, 167920), (200, 104950), (250, 83960), (400, 52475), (500, 41980), (625, 33584), (1000, 20990), (1250, 16792), (2000, 10495), (2099, 10000), (2500, 8396), (4198, 5000)]