21643839

素因数分解:

$3^2\times 7^2\times {\mathrm{17}}^1\times {\mathrm{2887}}^1$

素因数の和:2924

約数の個数: 36

約数和(自身を含む): 38520144

約数和(自身を除く): 16876305

約数列:

[1, 3, 7, 9, 17, 21, 49, 51, 63, 119, 147, 153, 357, 441, 833, 1071, 2499, 2887, 7497, 8661, 20209, 25983, 49079, 60627, 141463, 147237, 181881, 343553, 424389, 441711, 1030659, 1273167, 2404871, 3091977, 7214613, 21643839]

約数ペア:

[(1, 21643839), (3, 7214613), (7, 3091977), (9, 2404871), (17, 1273167), (21, 1030659), (49, 441711), (51, 424389), (63, 343553), (119, 181881), (147, 147237), (153, 141463), (357, 60627), (441, 49079), (833, 25983), (1071, 20209), (2499, 8661), (2887, 7497)]