21140820

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{257}}^1\times {\mathrm{457}}^1$

素因数の和:729

約数の個数: 72

約数和(自身を含む): 64517544

約数和(自身を除く): 43376724

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180, 257, 457, 514, 771, 914, 1028, 1285, 1371, 1542, 1828, 2285, 2313, 2570, 2742, 3084, 3855, 4113, 4570, 4626, 5140, 5484, 6855, 7710, 8226, 9140, 9252, 11565, 13710, 15420, 16452, 20565, 23130, 27420, 41130, 46260, 82260, 117449, 234898, 352347, 469796, 587245, 704694, 1057041, 1174490, 1409388, 1761735, 2114082, 2348980, 3523470, 4228164, 5285205, 7046940, 10570410, 21140820]

約数ペア:

[(1, 21140820), (2, 10570410), (3, 7046940), (4, 5285205), (5, 4228164), (6, 3523470), (9, 2348980), (10, 2114082), (12, 1761735), (15, 1409388), (18, 1174490), (20, 1057041), (30, 704694), (36, 587245), (45, 469796), (60, 352347), (90, 234898), (180, 117449), (257, 82260), (457, 46260), (514, 41130), (771, 27420), (914, 23130), (1028, 20565), (1285, 16452), (1371, 15420), (1542, 13710), (1828, 11565), (2285, 9252), (2313, 9140), (2570, 8226), (2742, 7710), (3084, 6855), (3855, 5484), (4113, 5140), (4570, 4626)]