1991680

素因数分解:

$2^{10}\times 5^1\times {\mathrm{389}}^1$

素因数の和:414

約数の個数: 44

約数和(自身を含む): 4789980

約数和(自身を除く): 2798300

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 389, 512, 640, 778, 1024, 1280, 1556, 1945, 2560, 3112, 3890, 5120, 6224, 7780, 12448, 15560, 24896, 31120, 49792, 62240, 99584, 124480, 199168, 248960, 398336, 497920, 995840, 1991680]

約数ペア:

[(1, 1991680), (2, 995840), (4, 497920), (5, 398336), (8, 248960), (10, 199168), (16, 124480), (20, 99584), (32, 62240), (40, 49792), (64, 31120), (80, 24896), (128, 15560), (160, 12448), (256, 7780), (320, 6224), (389, 5120), (512, 3890), (640, 3112), (778, 2560), (1024, 1945), (1280, 1556)]