21254792

素因数分解:

$2^3\times {\mathrm{13}}^2\times {\mathrm{79}}^1\times {\mathrm{199}}^1$

素因数の和:310

約数の個数: 48

約数和(自身を含む): 43920000

約数和(自身を除く): 22665208

約数列:

[1, 2, 4, 8, 13, 26, 52, 79, 104, 158, 169, 199, 316, 338, 398, 632, 676, 796, 1027, 1352, 1592, 2054, 2587, 4108, 5174, 8216, 10348, 13351, 15721, 20696, 26702, 31442, 33631, 53404, 62884, 67262, 106808, 125768, 134524, 204373, 269048, 408746, 817492, 1634984, 2656849, 5313698, 10627396, 21254792]

約数ペア:

[(1, 21254792), (2, 10627396), (4, 5313698), (8, 2656849), (13, 1634984), (26, 817492), (52, 408746), (79, 269048), (104, 204373), (158, 134524), (169, 125768), (199, 106808), (316, 67262), (338, 62884), (398, 53404), (632, 33631), (676, 31442), (796, 26702), (1027, 20696), (1352, 15721), (1592, 13351), (2054, 10348), (2587, 8216), (4108, 5174)]