19994600

素因数分解:

$2^3\times 5^2\times {\mathrm{257}}^1\times {\mathrm{389}}^1$

素因数の和:662

約数の個数: 48

約数和(自身を含む): 46788300

約数和(自身を除く): 26793700

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200, 257, 389, 514, 778, 1028, 1285, 1556, 1945, 2056, 2570, 3112, 3890, 5140, 6425, 7780, 9725, 10280, 12850, 15560, 19450, 25700, 38900, 51400, 77800, 99973, 199946, 399892, 499865, 799784, 999730, 1999460, 2499325, 3998920, 4998650, 9997300, 19994600]

約数ペア:

[(1, 19994600), (2, 9997300), (4, 4998650), (5, 3998920), (8, 2499325), (10, 1999460), (20, 999730), (25, 799784), (40, 499865), (50, 399892), (100, 199946), (200, 99973), (257, 77800), (389, 51400), (514, 38900), (778, 25700), (1028, 19450), (1285, 15560), (1556, 12850), (1945, 10280), (2056, 9725), (2570, 7780), (3112, 6425), (3890, 5140)]