19800080

素因数分解:

$2^4\times 5^1\times {\mathrm{247501}}^1$

素因数の和:247514

約数の個数: 20

約数和(自身を含む): 46035372

約数和(自身を除く): 26235292

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 247501, 495002, 990004, 1237505, 1980008, 2475010, 3960016, 4950020, 9900040, 19800080]

約数ペア:

[(1, 19800080), (2, 9900040), (4, 4950020), (5, 3960016), (8, 2475010), (10, 1980008), (16, 1237505), (20, 990004), (40, 495002), (80, 247501)]