1277991640

素因数分解:

$2^3\times 5^1\times {\mathrm{31949791}}^1$

素因数の和:31949802

約数の個数: 16

約数和(自身を含む): 2875481280

約数和(自身を除く): 1597489640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 31949791, 63899582, 127799164, 159748955, 255598328, 319497910, 638995820, 1277991640]

約数ペア:

[(1, 1277991640), (2, 638995820), (4, 319497910), (5, 255598328), (8, 159748955), (10, 127799164), (20, 63899582), (40, 31949791)]