18912509

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{59}}^1\times {\mathrm{181}}^1$

素因数の和:281

約数の個数: 32

約数和(自身を含む): 25159680

約数和(自身を除く): 6247171

約数列:

[1, 7, 11, 23, 59, 77, 161, 181, 253, 413, 649, 1267, 1357, 1771, 1991, 4163, 4543, 9499, 10679, 13937, 14927, 29141, 45793, 74753, 104489, 117469, 245617, 320551, 822283, 1719319, 2701787, 18912509]

約数ペア:

[(1, 18912509), (7, 2701787), (11, 1719319), (23, 822283), (59, 320551), (77, 245617), (161, 117469), (181, 104489), (253, 74753), (413, 45793), (649, 29141), (1267, 14927), (1357, 13937), (1771, 10679), (1991, 9499), (4163, 4543)]