1285000

素因数分解:

$2^3\times 5^4\times {\mathrm{257}}^1$

素因数の和:283

約数の個数: 40

約数和(自身を含む): 3022470

約数和(自身を除く): 1737470

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 257, 500, 514, 625, 1000, 1028, 1250, 1285, 2056, 2500, 2570, 5000, 5140, 6425, 10280, 12850, 25700, 32125, 51400, 64250, 128500, 160625, 257000, 321250, 642500, 1285000]

約数ペア:

[(1, 1285000), (2, 642500), (4, 321250), (5, 257000), (8, 160625), (10, 128500), (20, 64250), (25, 51400), (40, 32125), (50, 25700), (100, 12850), (125, 10280), (200, 6425), (250, 5140), (257, 5000), (500, 2570), (514, 2500), (625, 2056), (1000, 1285), (1028, 1250)]