19940560

素因数分解:

$2^4\times 5^1\times {\mathrm{249257}}^1$

素因数の和:249270

約数の個数: 20

約数和(自身を含む): 46361988

約数和(自身を除く): 26421428

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 249257, 498514, 997028, 1246285, 1994056, 2492570, 3988112, 4985140, 9970280, 19940560]

約数ペア:

[(1, 19940560), (2, 9970280), (4, 4985140), (5, 3988112), (8, 2492570), (10, 1994056), (16, 1246285), (20, 997028), (40, 498514), (80, 249257)]