21382405

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{12541}}^1$

素因数の和:12588

約数の個数: 16

約数和(自身を含む): 28896768

約数和(自身を除く): 7514363

約数列:

[1, 5, 11, 31, 55, 155, 341, 1705, 12541, 62705, 137951, 388771, 689755, 1943855, 4276481, 21382405]

約数ペア:

[(1, 21382405), (5, 4276481), (11, 1943855), (31, 689755), (55, 388771), (155, 137951), (341, 62705), (1705, 12541)]