21405856

素因数分解:

$2^5\times {\mathrm{17}}^1\times {\mathrm{19}}^2\times {\mathrm{109}}^1$

素因数の和:174

約数の個数: 72

約数和(自身を含む): 47525940

約数和(自身を除く): 26120084

約数列:

[1, 2, 4, 8, 16, 17, 19, 32, 34, 38, 68, 76, 109, 136, 152, 218, 272, 304, 323, 361, 436, 544, 608, 646, 722, 872, 1292, 1444, 1744, 1853, 2071, 2584, 2888, 3488, 3706, 4142, 5168, 5776, 6137, 7412, 8284, 10336, 11552, 12274, 14824, 16568, 24548, 29648, 33136, 35207, 39349, 49096, 59296, 66272, 70414, 78698, 98192, 140828, 157396, 196384, 281656, 314792, 563312, 629584, 668933, 1126624, 1259168, 1337866, 2675732, 5351464, 10702928, 21405856]

約数ペア:

[(1, 21405856), (2, 10702928), (4, 5351464), (8, 2675732), (16, 1337866), (17, 1259168), (19, 1126624), (32, 668933), (34, 629584), (38, 563312), (68, 314792), (76, 281656), (109, 196384), (136, 157396), (152, 140828), (218, 98192), (272, 78698), (304, 70414), (323, 66272), (361, 59296), (436, 49096), (544, 39349), (608, 35207), (646, 33136), (722, 29648), (872, 24548), (1292, 16568), (1444, 14824), (1744, 12274), (1853, 11552), (2071, 10336), (2584, 8284), (2888, 7412), (3488, 6137), (3706, 5776), (4142, 5168)]