20287550

素因数分解:

$2^1\times 5^2\times {\mathrm{47}}^1\times {\mathrm{89}}^1\times {\mathrm{97}}^1$

素因数の和:245

約数の個数: 48

約数和(自身を含む): 39372480

約数和(自身を除く): 19084930

約数列:

[1, 2, 5, 10, 25, 47, 50, 89, 94, 97, 178, 194, 235, 445, 470, 485, 890, 970, 1175, 2225, 2350, 2425, 4183, 4450, 4559, 4850, 8366, 8633, 9118, 17266, 20915, 22795, 41830, 43165, 45590, 86330, 104575, 113975, 209150, 215825, 227950, 405751, 431650, 811502, 2028755, 4057510, 10143775, 20287550]

約数ペア:

[(1, 20287550), (2, 10143775), (5, 4057510), (10, 2028755), (25, 811502), (47, 431650), (50, 405751), (89, 227950), (94, 215825), (97, 209150), (178, 113975), (194, 104575), (235, 86330), (445, 45590), (470, 43165), (485, 41830), (890, 22795), (970, 20915), (1175, 17266), (2225, 9118), (2350, 8633), (2425, 8366), (4183, 4850), (4450, 4559)]