21171980

素因数分解:

$2^2\times 5^1\times {\mathrm{137}}^1\times {\mathrm{7727}}^1$

素因数の和:7873

約数の個数: 24

約数和(自身を含む): 44791488

約数和(自身を除く): 23619508

約数列:

[1, 2, 4, 5, 10, 20, 137, 274, 548, 685, 1370, 2740, 7727, 15454, 30908, 38635, 77270, 154540, 1058599, 2117198, 4234396, 5292995, 10585990, 21171980]

約数ペア:

[(1, 21171980), (2, 10585990), (4, 5292995), (5, 4234396), (10, 2117198), (20, 1058599), (137, 154540), (274, 77270), (548, 38635), (685, 30908), (1370, 15454), (2740, 7727)]