19700000

素因数分解:

$2^5\times 5^5\times {\mathrm{197}}^1$

素因数の和:232

約数の個数: 72

約数和(自身を含む): 48723444

約数和(自身を除く): 29023444

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 125, 160, 197, 200, 250, 394, 400, 500, 625, 788, 800, 985, 1000, 1250, 1576, 1970, 2000, 2500, 3125, 3152, 3940, 4000, 4925, 5000, 6250, 6304, 7880, 9850, 10000, 12500, 15760, 19700, 20000, 24625, 25000, 31520, 39400, 49250, 50000, 78800, 98500, 100000, 123125, 157600, 197000, 246250, 394000, 492500, 615625, 788000, 985000, 1231250, 1970000, 2462500, 3940000, 4925000, 9850000, 19700000]

約数ペア:

[(1, 19700000), (2, 9850000), (4, 4925000), (5, 3940000), (8, 2462500), (10, 1970000), (16, 1231250), (20, 985000), (25, 788000), (32, 615625), (40, 492500), (50, 394000), (80, 246250), (100, 197000), (125, 157600), (160, 123125), (197, 100000), (200, 98500), (250, 78800), (394, 50000), (400, 49250), (500, 39400), (625, 31520), (788, 25000), (800, 24625), (985, 20000), (1000, 19700), (1250, 15760), (1576, 12500), (1970, 10000), (2000, 9850), (2500, 7880), (3125, 6304), (3152, 6250), (3940, 5000), (4000, 4925)]