20781136

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{197}}^1\times {\mathrm{347}}^1$

素因数の和:571

約数の個数: 40

約数和(自身を含む): 42720480

約数和(自身を除く): 21939344

約数列:

[1, 2, 4, 8, 16, 19, 38, 76, 152, 197, 304, 347, 394, 694, 788, 1388, 1576, 2776, 3152, 3743, 5552, 6593, 7486, 13186, 14972, 26372, 29944, 52744, 59888, 68359, 105488, 136718, 273436, 546872, 1093744, 1298821, 2597642, 5195284, 10390568, 20781136]

約数ペア:

[(1, 20781136), (2, 10390568), (4, 5195284), (8, 2597642), (16, 1298821), (19, 1093744), (38, 546872), (76, 273436), (152, 136718), (197, 105488), (304, 68359), (347, 59888), (394, 52744), (694, 29944), (788, 26372), (1388, 14972), (1576, 13186), (2776, 7486), (3152, 6593), (3743, 5552)]