20420356

素因数分解:

$2^2\times {\mathrm{11}}^1\times {\mathrm{43}}^2\times {\mathrm{251}}^1$

素因数の和:352

約数の個数: 36

約数和(自身を含む): 40071024

約数和(自身を除く): 19650668

約数列:

[1, 2, 4, 11, 22, 43, 44, 86, 172, 251, 473, 502, 946, 1004, 1849, 1892, 2761, 3698, 5522, 7396, 10793, 11044, 20339, 21586, 40678, 43172, 81356, 118723, 237446, 464099, 474892, 928198, 1856396, 5105089, 10210178, 20420356]

約数ペア:

[(1, 20420356), (2, 10210178), (4, 5105089), (11, 1856396), (22, 928198), (43, 474892), (44, 464099), (86, 237446), (172, 118723), (251, 81356), (473, 43172), (502, 40678), (946, 21586), (1004, 20339), (1849, 11044), (1892, 10793), (2761, 7396), (3698, 5522)]