20431640

素因数分解:

$2^3\times 5^1\times {\mathrm{353}}^1\times {\mathrm{1447}}^1$

素因数の和:1811

約数の個数: 32

約数和(自身を含む): 46133280

約数和(自身を除く): 25701640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 353, 706, 1412, 1447, 1765, 2824, 2894, 3530, 5788, 7060, 7235, 11576, 14120, 14470, 28940, 57880, 510791, 1021582, 2043164, 2553955, 4086328, 5107910, 10215820, 20431640]

約数ペア:

[(1, 20431640), (2, 10215820), (4, 5107910), (5, 4086328), (8, 2553955), (10, 2043164), (20, 1021582), (40, 510791), (353, 57880), (706, 28940), (1412, 14470), (1447, 14120), (1765, 11576), (2824, 7235), (2894, 7060), (3530, 5788)]