19891280

素因数分解:

$2^4\times 5^1\times {\mathrm{248641}}^1$

素因数の和:248654

約数の個数: 20

約数和(自身を含む): 46247412

約数和(自身を除く): 26356132

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 248641, 497282, 994564, 1243205, 1989128, 2486410, 3978256, 4972820, 9945640, 19891280]

約数ペア:

[(1, 19891280), (2, 9945640), (4, 4972820), (5, 3978256), (8, 2486410), (10, 1989128), (16, 1243205), (20, 994564), (40, 497282), (80, 248641)]