19988848

素因数分解:

$2^4\times {\mathrm{11}}^1\times {\mathrm{137}}^1\times {\mathrm{829}}^1$

素因数の和:985

約数の個数: 40

約数和(自身を含む): 42608880

約数和(自身を除く): 22620032

約数列:

[1, 2, 4, 8, 11, 16, 22, 44, 88, 137, 176, 274, 548, 829, 1096, 1507, 1658, 2192, 3014, 3316, 6028, 6632, 9119, 12056, 13264, 18238, 24112, 36476, 72952, 113573, 145904, 227146, 454292, 908584, 1249303, 1817168, 2498606, 4997212, 9994424, 19988848]

約数ペア:

[(1, 19988848), (2, 9994424), (4, 4997212), (8, 2498606), (11, 1817168), (16, 1249303), (22, 908584), (44, 454292), (88, 227146), (137, 145904), (176, 113573), (274, 72952), (548, 36476), (829, 24112), (1096, 18238), (1507, 13264), (1658, 12056), (2192, 9119), (3014, 6632), (3316, 6028)]