19990480

素因数分解:

$2^4\times 5^1\times {\mathrm{249881}}^1$

素因数の和:249894

約数の個数: 20

約数和(自身を含む): 46478052

約数和(自身を除く): 26487572

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 249881, 499762, 999524, 1249405, 1999048, 2498810, 3998096, 4997620, 9995240, 19990480]

約数ペア:

[(1, 19990480), (2, 9995240), (4, 4997620), (5, 3998096), (8, 2498810), (10, 1999048), (16, 1249405), (20, 999524), (40, 499762), (80, 249881)]