638660560

素因数分解:

$2^4\times 5^1\times {\mathrm{7983257}}^1$

素因数の和:7983270

約数の個数: 20

約数和(自身を含む): 1484885988

約数和(自身を除く): 846225428

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 7983257, 15966514, 31933028, 39916285, 63866056, 79832570, 127732112, 159665140, 319330280, 638660560]

約数ペア:

[(1, 638660560), (2, 319330280), (4, 159665140), (5, 127732112), (8, 79832570), (10, 63866056), (16, 39916285), (20, 31933028), (40, 15966514), (80, 7983257)]