21040720

素因数分解:

$2^4\times 5^1\times {\mathrm{263009}}^1$

素因数の和:263022

約数の個数: 20

約数和(自身を含む): 48919860

約数和(自身を除く): 27879140

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 263009, 526018, 1052036, 1315045, 2104072, 2630090, 4208144, 5260180, 10520360, 21040720]

約数ペア:

[(1, 21040720), (2, 10520360), (4, 5260180), (5, 4208144), (8, 2630090), (10, 2104072), (16, 1315045), (20, 1052036), (40, 526018), (80, 263009)]