21000886180

素因数分解:

$2^2\times 5^1\times {\mathrm{137}}^1\times {\mathrm{7664557}}^1$

素因数の和:7664703

約数の個数: 24

約数和(自身を含む): 44423778168

約数和(自身を除く): 23422891988

約数列:

[1, 2, 4, 5, 10, 20, 137, 274, 548, 685, 1370, 2740, 7664557, 15329114, 30658228, 38322785, 76645570, 153291140, 1050044309, 2100088618, 4200177236, 5250221545, 10500443090, 21000886180]

約数ペア:

[(1, 21000886180), (2, 10500443090), (4, 5250221545), (5, 4200177236), (10, 2100088618), (20, 1050044309), (137, 153291140), (274, 76645570), (548, 38322785), (685, 30658228), (1370, 15329114), (2740, 7664557)]