21405080

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{7537}}^1$

素因数の和:7619

約数の個数: 32

約数和(自身を含む): 48846240

約数和(自身を除く): 27441160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 142, 284, 355, 568, 710, 1420, 2840, 7537, 15074, 30148, 37685, 60296, 75370, 150740, 301480, 535127, 1070254, 2140508, 2675635, 4281016, 5351270, 10702540, 21405080]

約数ペア:

[(1, 21405080), (2, 10702540), (4, 5351270), (5, 4281016), (8, 2675635), (10, 2140508), (20, 1070254), (40, 535127), (71, 301480), (142, 150740), (284, 75370), (355, 60296), (568, 37685), (710, 30148), (1420, 15074), (2840, 7537)]