19988240

素因数分解:

$2^4\times 5^1\times {\mathrm{249853}}^1$

素因数の和:249866

約数の個数: 20

約数和(自身を含む): 46472844

約数和(自身を除く): 26484604

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 249853, 499706, 999412, 1249265, 1998824, 2498530, 3997648, 4997060, 9994120, 19988240]

約数ペア:

[(1, 19988240), (2, 9994120), (4, 4997060), (5, 3997648), (8, 2498530), (10, 1998824), (16, 1249265), (20, 999412), (40, 499706), (80, 249853)]