20991907041

素因数分解:

$3^1\times 7^1\times {\mathrm{1549}}^1\times {\mathrm{645329}}^1$

素因数の和:646888

約数の個数: 16

約数和(自身を含む): 32008368000

約数和(自身を除く): 11016460959

約数列:

[1, 3, 7, 21, 1549, 4647, 10843, 32529, 645329, 1935987, 4517303, 13551909, 999614621, 2998843863, 6997302347, 20991907041]

約数ペア:

[(1, 20991907041), (3, 6997302347), (7, 2998843863), (21, 999614621), (1549, 13551909), (4647, 4517303), (10843, 1935987), (32529, 645329)]