19804240

素因数分解:

$2^4\times 5^1\times {\mathrm{247553}}^1$

素因数の和:247566

約数の個数: 20

約数和(自身を含む): 46045044

約数和(自身を除く): 26240804

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 247553, 495106, 990212, 1237765, 1980424, 2475530, 3960848, 4951060, 9902120, 19804240]

約数ペア:

[(1, 19804240), (2, 9902120), (4, 4951060), (5, 3960848), (8, 2475530), (10, 1980424), (16, 1237765), (20, 990212), (40, 495106), (80, 247553)]