20387920

素因数分解:

$2^4\times 5^1\times 7^3\times {\mathrm{743}}^1$

素因数の和:777

約数の個数: 80

約数和(自身を含む): 55353600

約数和(自身を除く): 34965680

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 56, 70, 80, 98, 112, 140, 196, 245, 280, 343, 392, 490, 560, 686, 743, 784, 980, 1372, 1486, 1715, 1960, 2744, 2972, 3430, 3715, 3920, 5201, 5488, 5944, 6860, 7430, 10402, 11888, 13720, 14860, 20804, 26005, 27440, 29720, 36407, 41608, 52010, 59440, 72814, 83216, 104020, 145628, 182035, 208040, 254849, 291256, 364070, 416080, 509698, 582512, 728140, 1019396, 1274245, 1456280, 2038792, 2548490, 2912560, 4077584, 5096980, 10193960, 20387920]

約数ペア:

[(1, 20387920), (2, 10193960), (4, 5096980), (5, 4077584), (7, 2912560), (8, 2548490), (10, 2038792), (14, 1456280), (16, 1274245), (20, 1019396), (28, 728140), (35, 582512), (40, 509698), (49, 416080), (56, 364070), (70, 291256), (80, 254849), (98, 208040), (112, 182035), (140, 145628), (196, 104020), (245, 83216), (280, 72814), (343, 59440), (392, 52010), (490, 41608), (560, 36407), (686, 29720), (743, 27440), (784, 26005), (980, 20804), (1372, 14860), (1486, 13720), (1715, 11888), (1960, 10402), (2744, 7430), (2972, 6860), (3430, 5944), (3715, 5488), (3920, 5201)]