21254255

素因数分解:

$5^1\times {\mathrm{11}}^2\times {\mathrm{19}}^1\times {\mathrm{43}}^2$

素因数の和:132

約数の個数: 36

約数和(自身を含む): 30212280

約数和(自身を除く): 8958025

約数列:

[1, 5, 11, 19, 43, 55, 95, 121, 209, 215, 473, 605, 817, 1045, 1849, 2299, 2365, 4085, 5203, 8987, 9245, 11495, 20339, 26015, 35131, 44935, 98857, 101695, 175655, 223729, 386441, 494285, 1118645, 1932205, 4250851, 21254255]

約数ペア:

[(1, 21254255), (5, 4250851), (11, 1932205), (19, 1118645), (43, 494285), (55, 386441), (95, 223729), (121, 175655), (209, 101695), (215, 98857), (473, 44935), (605, 35131), (817, 26015), (1045, 20339), (1849, 11495), (2299, 9245), (2365, 8987), (4085, 5203)]