20565140

素因数分解:

$2^2\times 5^1\times {\mathrm{257}}^1\times {\mathrm{4001}}^1$

素因数の和:4267

約数の個数: 24

約数和(自身を含む): 43365672

約数和(自身を除く): 22800532

約数列:

[1, 2, 4, 5, 10, 20, 257, 514, 1028, 1285, 2570, 4001, 5140, 8002, 16004, 20005, 40010, 80020, 1028257, 2056514, 4113028, 5141285, 10282570, 20565140]

約数ペア:

[(1, 20565140), (2, 10282570), (4, 5141285), (5, 4113028), (10, 2056514), (20, 1028257), (257, 80020), (514, 40010), (1028, 20005), (1285, 16004), (2570, 8002), (4001, 5140)]