19947920

素因数分解:

$2^4\times 5^1\times {\mathrm{389}}^1\times {\mathrm{641}}^1$

素因数の和:1043

約数の個数: 40

約数和(自身を含む): 46570680

約数和(自身を除く): 26622760

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 389, 641, 778, 1282, 1556, 1945, 2564, 3112, 3205, 3890, 5128, 6224, 6410, 7780, 10256, 12820, 15560, 25640, 31120, 51280, 249349, 498698, 997396, 1246745, 1994792, 2493490, 3989584, 4986980, 9973960, 19947920]

約数ペア:

[(1, 19947920), (2, 9973960), (4, 4986980), (5, 3989584), (8, 2493490), (10, 1994792), (16, 1246745), (20, 997396), (40, 498698), (80, 249349), (389, 51280), (641, 31120), (778, 25640), (1282, 15560), (1556, 12820), (1945, 10256), (2564, 7780), (3112, 6410), (3205, 6224), (3890, 5128)]