18909904

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{229}}^1\times {\mathrm{397}}^1$

素因数の和:647

約数の個数: 40

約数和(自身を含む): 39728360

約数和(自身を除く): 20818456

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 229, 397, 458, 794, 916, 1588, 1832, 2977, 3176, 3664, 5161, 5954, 6352, 10322, 11908, 20644, 23816, 41288, 47632, 82576, 90913, 181826, 363652, 727304, 1181869, 1454608, 2363738, 4727476, 9454952, 18909904]

約数ペア:

[(1, 18909904), (2, 9454952), (4, 4727476), (8, 2363738), (13, 1454608), (16, 1181869), (26, 727304), (52, 363652), (104, 181826), (208, 90913), (229, 82576), (397, 47632), (458, 41288), (794, 23816), (916, 20644), (1588, 11908), (1832, 10322), (2977, 6352), (3176, 5954), (3664, 5161)]