20971960

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{137}}^1$

素因数の和:280

約数の個数: 64

約数和(自身を含む): 49183200

約数和(自身を除く): 28211240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 89, 137, 172, 178, 215, 274, 344, 356, 430, 445, 548, 685, 712, 860, 890, 1096, 1370, 1720, 1780, 2740, 3560, 3827, 5480, 5891, 7654, 11782, 12193, 15308, 19135, 23564, 24386, 29455, 30616, 38270, 47128, 48772, 58910, 60965, 76540, 97544, 117820, 121930, 153080, 235640, 243860, 487720, 524299, 1048598, 2097196, 2621495, 4194392, 5242990, 10485980, 20971960]

約数ペア:

[(1, 20971960), (2, 10485980), (4, 5242990), (5, 4194392), (8, 2621495), (10, 2097196), (20, 1048598), (40, 524299), (43, 487720), (86, 243860), (89, 235640), (137, 153080), (172, 121930), (178, 117820), (215, 97544), (274, 76540), (344, 60965), (356, 58910), (430, 48772), (445, 47128), (548, 38270), (685, 30616), (712, 29455), (860, 24386), (890, 23564), (1096, 19135), (1370, 15308), (1720, 12193), (1780, 11782), (2740, 7654), (3560, 5891), (3827, 5480)]