21209815

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{271}}^1\times {\mathrm{1423}}^1$

素因数の和:1710

約数の個数: 16

約数和(自身を含む): 27887616

約数和(自身を除く): 6677801

約数列:

[1, 5, 11, 55, 271, 1355, 1423, 2981, 7115, 14905, 15653, 78265, 385633, 1928165, 4241963, 21209815]

約数ペア:

[(1, 21209815), (5, 4241963), (11, 1928165), (55, 385633), (271, 78265), (1355, 15653), (1423, 14905), (2981, 7115)]