12990020

素因数分解:

$2^2\times 5^1\times {\mathrm{649501}}^1$

素因数の和:649510

約数の個数: 12

約数和(自身を含む): 27279084

約数和(自身を除く): 14289064

約数列:

[1, 2, 4, 5, 10, 20, 649501, 1299002, 2598004, 3247505, 6495010, 12990020]

約数ペア:

[(1, 12990020), (2, 6495010), (4, 3247505), (5, 2598004), (10, 1299002), (20, 649501)]