21639440

素因数分解:

$2^4\times 5^1\times {\mathrm{270493}}^1$

素因数の和:270506

約数の個数: 20

約数和(自身を含む): 50311884

約数和(自身を除く): 28672444

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 270493, 540986, 1081972, 1352465, 2163944, 2704930, 4327888, 5409860, 10819720, 21639440]

約数ペア:

[(1, 21639440), (2, 10819720), (4, 5409860), (5, 4327888), (8, 2704930), (10, 2163944), (16, 1352465), (20, 1081972), (40, 540986), (80, 270493)]