3998920

素因数分解:

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

素因数の和:657

約数の個数: 32

約数和(自身を含む): 9055800

約数和(自身を除く): 5056880

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 257, 389, 514, 778, 1028, 1285, 1556, 1945, 2056, 2570, 3112, 3890, 5140, 7780, 10280, 15560, 99973, 199946, 399892, 499865, 799784, 999730, 1999460, 3998920]

約数ペア:

[(1, 3998920), (2, 1999460), (4, 999730), (5, 799784), (8, 499865), (10, 399892), (20, 199946), (40, 99973), (257, 15560), (389, 10280), (514, 7780), (778, 5140), (1028, 3890), (1285, 3112), (1556, 2570), (1945, 2056)]