21255185

素因数分解:

$5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{139}}^1\times {\mathrm{257}}^1$

素因数の和:425

約数の個数: 32

約数和(自身を含む): 31207680

約数和(自身を除く): 9952495

約数列:

[1, 5, 7, 17, 35, 85, 119, 139, 257, 595, 695, 973, 1285, 1799, 2363, 4369, 4865, 8995, 11815, 16541, 21845, 30583, 35723, 82705, 152915, 178615, 250061, 607291, 1250305, 3036455, 4251037, 21255185]

約数ペア:

[(1, 21255185), (5, 4251037), (7, 3036455), (17, 1250305), (35, 607291), (85, 250061), (119, 178615), (139, 152915), (257, 82705), (595, 35723), (695, 30583), (973, 21845), (1285, 16541), (1799, 11815), (2363, 8995), (4369, 4865)]