19916800

素因数分解:

$2^{11}\times 5^2\times {\mathrm{389}}^1$

素因数の和:421

約数の個数: 72

約数和(自身を含む): 49508550

約数和(自身を除く): 29591750

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 128, 160, 200, 256, 320, 389, 400, 512, 640, 778, 800, 1024, 1280, 1556, 1600, 1945, 2048, 2560, 3112, 3200, 3890, 5120, 6224, 6400, 7780, 9725, 10240, 12448, 12800, 15560, 19450, 24896, 25600, 31120, 38900, 49792, 51200, 62240, 77800, 99584, 124480, 155600, 199168, 248960, 311200, 398336, 497920, 622400, 796672, 995840, 1244800, 1991680, 2489600, 3983360, 4979200, 9958400, 19916800]

約数ペア:

[(1, 19916800), (2, 9958400), (4, 4979200), (5, 3983360), (8, 2489600), (10, 1991680), (16, 1244800), (20, 995840), (25, 796672), (32, 622400), (40, 497920), (50, 398336), (64, 311200), (80, 248960), (100, 199168), (128, 155600), (160, 124480), (200, 99584), (256, 77800), (320, 62240), (389, 51200), (400, 49792), (512, 38900), (640, 31120), (778, 25600), (800, 24896), (1024, 19450), (1280, 15560), (1556, 12800), (1600, 12448), (1945, 10240), (2048, 9725), (2560, 7780), (3112, 6400), (3200, 6224), (3890, 5120)]