19640080

素因数分解:

$2^4\times 5^1\times {\mathrm{245501}}^1$

素因数の和:245514

約数の個数: 20

約数和(自身を含む): 45663372

約数和(自身を除く): 26023292

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 245501, 491002, 982004, 1227505, 1964008, 2455010, 3928016, 4910020, 9820040, 19640080]

約数ペア:

[(1, 19640080), (2, 9820040), (4, 4910020), (5, 3928016), (8, 2455010), (10, 1964008), (16, 1227505), (20, 982004), (40, 491002), (80, 245501)]