128857420

素因数分解:

$2^2\times 5^1\times {\mathrm{6442871}}^1$

素因数の和:6442880

約数の個数: 12

約数和(自身を含む): 270600624

約数和(自身を除く): 141743204

約数列:

[1, 2, 4, 5, 10, 20, 6442871, 12885742, 25771484, 32214355, 64428710, 128857420]

約数ペア:

[(1, 128857420), (2, 64428710), (4, 32214355), (5, 25771484), (10, 12885742), (20, 6442871)]