21515115

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{139}}^1\times {\mathrm{607}}^1$

素因数の和:771

約数の個数: 32

約数和(自身を含む): 36771840

約数和(自身を除く): 15256725

約数列:

[1, 3, 5, 15, 17, 51, 85, 139, 255, 417, 607, 695, 1821, 2085, 2363, 3035, 7089, 9105, 10319, 11815, 30957, 35445, 51595, 84373, 154785, 253119, 421865, 1265595, 1434341, 4303023, 7171705, 21515115]

約数ペア:

[(1, 21515115), (3, 7171705), (5, 4303023), (15, 1434341), (17, 1265595), (51, 421865), (85, 253119), (139, 154785), (255, 84373), (417, 51595), (607, 35445), (695, 30957), (1821, 11815), (2085, 10319), (2363, 9105), (3035, 7089)]