639732880

素因数分解:

$2^4\times 5^1\times {\mathrm{7996661}}^1$

素因数の和:7996674

約数の個数: 20

約数和(自身を含む): 1487379132

約数和(自身を除く): 847646252

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 7996661, 15993322, 31986644, 39983305, 63973288, 79966610, 127946576, 159933220, 319866440, 639732880]

約数ペア:

[(1, 639732880), (2, 319866440), (4, 159933220), (5, 127946576), (8, 79966610), (10, 63973288), (16, 39983305), (20, 31986644), (40, 15993322), (80, 7996661)]