21136208

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{251}}^1\times {\mathrm{277}}^1$

素因数の和:555

約数の個数: 40

約数和(自身を含む): 43434720

約数和(自身を除く): 22298512

約数列:

[1, 2, 4, 8, 16, 19, 38, 76, 152, 251, 277, 304, 502, 554, 1004, 1108, 2008, 2216, 4016, 4432, 4769, 5263, 9538, 10526, 19076, 21052, 38152, 42104, 69527, 76304, 84208, 139054, 278108, 556216, 1112432, 1321013, 2642026, 5284052, 10568104, 21136208]

約数ペア:

[(1, 21136208), (2, 10568104), (4, 5284052), (8, 2642026), (16, 1321013), (19, 1112432), (38, 556216), (76, 278108), (152, 139054), (251, 84208), (277, 76304), (304, 69527), (502, 42104), (554, 38152), (1004, 21052), (1108, 19076), (2008, 10526), (2216, 9538), (4016, 5263), (4432, 4769)]