21991240

素因数分解:

$2^3\times 5^1\times {\mathrm{137}}^1\times {\mathrm{4013}}^1$

素因数の和:4161

約数の個数: 32

約数和(自身を含む): 49853880

約数和(自身を除く): 27862640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 137, 274, 548, 685, 1096, 1370, 2740, 4013, 5480, 8026, 16052, 20065, 32104, 40130, 80260, 160520, 549781, 1099562, 2199124, 2748905, 4398248, 5497810, 10995620, 21991240]

約数ペア:

[(1, 21991240), (2, 10995620), (4, 5497810), (5, 4398248), (8, 2748905), (10, 2199124), (20, 1099562), (40, 549781), (137, 160520), (274, 80260), (548, 40130), (685, 32104), (1096, 20065), (1370, 16052), (2740, 8026), (4013, 5480)]