20491880

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{59}}^1\times {\mathrm{457}}^1$

素因数の和:546

約数の個数: 64

約数和(自身を含む): 49464000

約数和(自身を除く): 28972120

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 59, 76, 95, 118, 152, 190, 236, 295, 380, 457, 472, 590, 760, 914, 1121, 1180, 1828, 2242, 2285, 2360, 3656, 4484, 4570, 5605, 8683, 8968, 9140, 11210, 17366, 18280, 22420, 26963, 34732, 43415, 44840, 53926, 69464, 86830, 107852, 134815, 173660, 215704, 269630, 347320, 512297, 539260, 1024594, 1078520, 2049188, 2561485, 4098376, 5122970, 10245940, 20491880]

約数ペア:

[(1, 20491880), (2, 10245940), (4, 5122970), (5, 4098376), (8, 2561485), (10, 2049188), (19, 1078520), (20, 1024594), (38, 539260), (40, 512297), (59, 347320), (76, 269630), (95, 215704), (118, 173660), (152, 134815), (190, 107852), (236, 86830), (295, 69464), (380, 53926), (457, 44840), (472, 43415), (590, 34732), (760, 26963), (914, 22420), (1121, 18280), (1180, 17366), (1828, 11210), (2242, 9140), (2285, 8968), (2360, 8683), (3656, 5605), (4484, 4570)]