20408157

素因数分解:

$3^2\times 7^3\times {\mathrm{11}}^1\times {\mathrm{601}}^1$

素因数の和:639

約数の個数: 48

約数和(自身を含む): 37564800

約数和(自身を除く): 17156643

約数列:

[1, 3, 7, 9, 11, 21, 33, 49, 63, 77, 99, 147, 231, 343, 441, 539, 601, 693, 1029, 1617, 1803, 3087, 3773, 4207, 4851, 5409, 6611, 11319, 12621, 19833, 29449, 33957, 37863, 46277, 59499, 88347, 138831, 206143, 265041, 323939, 416493, 618429, 971817, 1855287, 2267573, 2915451, 6802719, 20408157]

約数ペア:

[(1, 20408157), (3, 6802719), (7, 2915451), (9, 2267573), (11, 1855287), (21, 971817), (33, 618429), (49, 416493), (63, 323939), (77, 265041), (99, 206143), (147, 138831), (231, 88347), (343, 59499), (441, 46277), (539, 37863), (601, 33957), (693, 29449), (1029, 19833), (1617, 12621), (1803, 11319), (3087, 6611), (3773, 5409), (4207, 4851)]