19870120

素因数分解:

$2^3\times 5^1\times {\mathrm{389}}^1\times {\mathrm{1277}}^1$

素因数の和:1677

約数の個数: 32

約数和(自身を含む): 44857800

約数和(自身を除く): 24987680

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 389, 778, 1277, 1556, 1945, 2554, 3112, 3890, 5108, 6385, 7780, 10216, 12770, 15560, 25540, 51080, 496753, 993506, 1987012, 2483765, 3974024, 4967530, 9935060, 19870120]

約数ペア:

[(1, 19870120), (2, 9935060), (4, 4967530), (5, 3974024), (8, 2483765), (10, 1987012), (20, 993506), (40, 496753), (389, 51080), (778, 25540), (1277, 15560), (1556, 12770), (1945, 10216), (2554, 7780), (3112, 6385), (3890, 5108)]