20342500

素因数分解:

$2^2\times 5^4\times {\mathrm{79}}^1\times {\mathrm{103}}^1$

素因数の和:206

約数の個数: 60

約数和(自身を含む): 45485440

約数和(自身を除く): 25142940

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 79, 100, 103, 125, 158, 206, 250, 316, 395, 412, 500, 515, 625, 790, 1030, 1250, 1580, 1975, 2060, 2500, 2575, 3950, 5150, 7900, 8137, 9875, 10300, 12875, 16274, 19750, 25750, 32548, 39500, 40685, 49375, 51500, 64375, 81370, 98750, 128750, 162740, 197500, 203425, 257500, 406850, 813700, 1017125, 2034250, 4068500, 5085625, 10171250, 20342500]

約数ペア:

[(1, 20342500), (2, 10171250), (4, 5085625), (5, 4068500), (10, 2034250), (20, 1017125), (25, 813700), (50, 406850), (79, 257500), (100, 203425), (103, 197500), (125, 162740), (158, 128750), (206, 98750), (250, 81370), (316, 64375), (395, 51500), (412, 49375), (500, 40685), (515, 39500), (625, 32548), (790, 25750), (1030, 19750), (1250, 16274), (1580, 12875), (1975, 10300), (2060, 9875), (2500, 8137), (2575, 7900), (3950, 5150)]