21387639

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{157}}^1\times {\mathrm{499}}^1$

素因数の和:679

約数の個数: 32

約数和(自身を含む): 35392000

約数和(自身を除く): 14004361

約数列:

[1, 3, 7, 13, 21, 39, 91, 157, 273, 471, 499, 1099, 1497, 2041, 3297, 3493, 6123, 6487, 10479, 14287, 19461, 42861, 45409, 78343, 136227, 235029, 548401, 1018459, 1645203, 3055377, 7129213, 21387639]

約数ペア:

[(1, 21387639), (3, 7129213), (7, 3055377), (13, 1645203), (21, 1018459), (39, 548401), (91, 235029), (157, 136227), (273, 78343), (471, 45409), (499, 42861), (1099, 19461), (1497, 14287), (2041, 10479), (3297, 6487), (3493, 6123)]