21081560

素因数分解:

$2^3\times 5^1\times {\mathrm{137}}^1\times {\mathrm{3847}}^1$

素因数の和:3995

約数の個数: 32

約数和(自身を含む): 47792160

約数和(自身を除く): 26710600

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 137, 274, 548, 685, 1096, 1370, 2740, 3847, 5480, 7694, 15388, 19235, 30776, 38470, 76940, 153880, 527039, 1054078, 2108156, 2635195, 4216312, 5270390, 10540780, 21081560]

約数ペア:

[(1, 21081560), (2, 10540780), (4, 5270390), (5, 4216312), (8, 2635195), (10, 2108156), (20, 1054078), (40, 527039), (137, 153880), (274, 76940), (548, 38470), (685, 30776), (1096, 19235), (1370, 15388), (2740, 7694), (3847, 5480)]