640490450

素因数分解:

$2^1\times 5^2\times {\mathrm{12809809}}^1$

素因数の和:12809821

約数の個数: 12

約数和(自身を含む): 1191312330

約数和(自身を除く): 550821880

約数列:

[1, 2, 5, 10, 25, 50, 12809809, 25619618, 64049045, 128098090, 320245225, 640490450]

約数ペア:

[(1, 640490450), (2, 320245225), (5, 128098090), (10, 64049045), (25, 25619618), (50, 12809809)]