19989805

素因数分解:

$5^1\times {\mathrm{11}}^2\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{47}}^1$

素因数の和:130

約数の個数: 48

約数和(自身を含む): 29111040

約数和(自身を除く): 9121235

約数列:

[1, 5, 11, 19, 37, 47, 55, 95, 121, 185, 209, 235, 407, 517, 605, 703, 893, 1045, 1739, 2035, 2299, 2585, 3515, 4465, 4477, 5687, 7733, 8695, 9823, 11495, 19129, 22385, 28435, 33041, 38665, 49115, 85063, 95645, 108053, 165205, 210419, 363451, 425315, 540265, 1052095, 1817255, 3997961, 19989805]

約数ペア:

[(1, 19989805), (5, 3997961), (11, 1817255), (19, 1052095), (37, 540265), (47, 425315), (55, 363451), (95, 210419), (121, 165205), (185, 108053), (209, 95645), (235, 85063), (407, 49115), (517, 38665), (605, 33041), (703, 28435), (893, 22385), (1045, 19129), (1739, 11495), (2035, 9823), (2299, 8695), (2585, 7733), (3515, 5687), (4465, 4477)]