20991608

素因数分解:

$2^3\times {\mathrm{11}}^1\times {\mathrm{263}}^1\times {\mathrm{907}}^1$

素因数の和:1187

約数の個数: 32

約数和(自身を含む): 43148160

約数和(自身を除く): 22156552

約数列:

[1, 2, 4, 8, 11, 22, 44, 88, 263, 526, 907, 1052, 1814, 2104, 2893, 3628, 5786, 7256, 9977, 11572, 19954, 23144, 39908, 79816, 238541, 477082, 954164, 1908328, 2623951, 5247902, 10495804, 20991608]

約数ペア:

[(1, 20991608), (2, 10495804), (4, 5247902), (8, 2623951), (11, 1908328), (22, 954164), (44, 477082), (88, 238541), (263, 79816), (526, 39908), (907, 23144), (1052, 19954), (1814, 11572), (2104, 9977), (2893, 7256), (3628, 5786)]