18791840

素因数分解:

$2^5\times 5^1\times {\mathrm{257}}^1\times {\mathrm{457}}^1$

素因数の和:729

約数の個数: 48

約数和(自身を含む): 44665992

約数和(自身を除く): 25874152

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 257, 457, 514, 914, 1028, 1285, 1828, 2056, 2285, 2570, 3656, 4112, 4570, 5140, 7312, 8224, 9140, 10280, 14624, 18280, 20560, 36560, 41120, 73120, 117449, 234898, 469796, 587245, 939592, 1174490, 1879184, 2348980, 3758368, 4697960, 9395920, 18791840]

約数ペア:

[(1, 18791840), (2, 9395920), (4, 4697960), (5, 3758368), (8, 2348980), (10, 1879184), (16, 1174490), (20, 939592), (32, 587245), (40, 469796), (80, 234898), (160, 117449), (257, 73120), (457, 41120), (514, 36560), (914, 20560), (1028, 18280), (1285, 14624), (1828, 10280), (2056, 9140), (2285, 8224), (2570, 7312), (3656, 5140), (4112, 4570)]