20911720

素因数分解:

$2^3\times 5^1\times {\mathrm{353}}^1\times {\mathrm{1481}}^1$

素因数の和:1845

約数の個数: 32

約数和(自身を含む): 47216520

約数和(自身を除く): 26304800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 353, 706, 1412, 1481, 1765, 2824, 2962, 3530, 5924, 7060, 7405, 11848, 14120, 14810, 29620, 59240, 522793, 1045586, 2091172, 2613965, 4182344, 5227930, 10455860, 20911720]

約数ペア:

[(1, 20911720), (2, 10455860), (4, 5227930), (5, 4182344), (8, 2613965), (10, 2091172), (20, 1045586), (40, 522793), (353, 59240), (706, 29620), (1412, 14810), (1481, 14120), (1765, 11848), (2824, 7405), (2962, 7060), (3530, 5924)]