21445040

素因数分解:

$2^4\times 5^1\times {\mathrm{268063}}^1$

素因数の和:268076

約数の個数: 20

約数和(自身を含む): 49859904

約数和(自身を除く): 28414864

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 268063, 536126, 1072252, 1340315, 2144504, 2680630, 4289008, 5361260, 10722520, 21445040]

約数ペア:

[(1, 21445040), (2, 10722520), (4, 5361260), (5, 4289008), (8, 2680630), (10, 2144504), (16, 1340315), (20, 1072252), (40, 536126), (80, 268063)]