21949221

素因数分解:

$3^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{109}}^1\times {\mathrm{223}}^1$

素因数の和:385

約数の個数: 32

約数和(自身を含む): 34693120

約数和(自身を除く): 12743899

約数列:

[1, 3, 7, 21, 43, 109, 129, 223, 301, 327, 669, 763, 903, 1561, 2289, 4683, 4687, 9589, 14061, 24307, 28767, 32809, 67123, 72921, 98427, 170149, 201369, 510447, 1045201, 3135603, 7316407, 21949221]

約数ペア:

[(1, 21949221), (3, 7316407), (7, 3135603), (21, 1045201), (43, 510447), (109, 201369), (129, 170149), (223, 98427), (301, 72921), (327, 67123), (669, 32809), (763, 28767), (903, 24307), (1561, 14061), (2289, 9589), (4683, 4687)]