21355768

素因数分解:

$2^3\times 7^2\times {\mathrm{157}}^1\times {\mathrm{347}}^1$

素因数の和:524

約数の個数: 48

約数和(自身を含む): 47011320

約数和(自身を除く): 25655552

約数列:

[1, 2, 4, 7, 8, 14, 28, 49, 56, 98, 157, 196, 314, 347, 392, 628, 694, 1099, 1256, 1388, 2198, 2429, 2776, 4396, 4858, 7693, 8792, 9716, 15386, 17003, 19432, 30772, 34006, 54479, 61544, 68012, 108958, 136024, 217916, 381353, 435832, 762706, 1525412, 2669471, 3050824, 5338942, 10677884, 21355768]

約数ペア:

[(1, 21355768), (2, 10677884), (4, 5338942), (7, 3050824), (8, 2669471), (14, 1525412), (28, 762706), (49, 435832), (56, 381353), (98, 217916), (157, 136024), (196, 108958), (314, 68012), (347, 61544), (392, 54479), (628, 34006), (694, 30772), (1099, 19432), (1256, 17003), (1388, 15386), (2198, 9716), (2429, 8792), (2776, 7693), (4396, 4858)]