18978905

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{73}}^1\times {\mathrm{163}}^1$

素因数の和:281

約数の個数: 32

約数和(自身を含む): 26213760

約数和(自身を除く): 7234855

約数列:

[1, 5, 11, 29, 55, 73, 145, 163, 319, 365, 803, 815, 1595, 1793, 2117, 4015, 4727, 8965, 10585, 11899, 23287, 23635, 51997, 59495, 116435, 130889, 259985, 345071, 654445, 1725355, 3795781, 18978905]

約数ペア:

[(1, 18978905), (5, 3795781), (11, 1725355), (29, 654445), (55, 345071), (73, 259985), (145, 130889), (163, 116435), (319, 59495), (365, 51997), (803, 23635), (815, 23287), (1595, 11899), (1793, 10585), (2117, 8965), (4015, 4727)]