19812080

素因数分解:

$2^4\times 5^1\times {\mathrm{247651}}^1$

素因数の和:247664

約数の個数: 20

約数和(自身を含む): 46063272

約数和(自身を除く): 26251192

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 247651, 495302, 990604, 1238255, 1981208, 2476510, 3962416, 4953020, 9906040, 19812080]

約数ペア:

[(1, 19812080), (2, 9906040), (4, 4953020), (5, 3962416), (8, 2476510), (10, 1981208), (16, 1238255), (20, 990604), (40, 495302), (80, 247651)]