19989680

素因数分解:

$2^4\times 5^1\times {\mathrm{249871}}^1$

素因数の和:249884

約数の個数: 20

約数和(自身を含む): 46476192

約数和(自身を除く): 26486512

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 249871, 499742, 999484, 1249355, 1998968, 2498710, 3997936, 4997420, 9994840, 19989680]

約数ペア:

[(1, 19989680), (2, 9994840), (4, 4997420), (5, 3997936), (8, 2498710), (10, 1998968), (16, 1249355), (20, 999484), (40, 499742), (80, 249871)]