21354815

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{311}}^1\times {\mathrm{443}}^1$

素因数の和:790

約数の個数: 16

約数和(自身を含む): 26597376

約数和(自身を除く): 5242561

約数列:

[1, 5, 31, 155, 311, 443, 1555, 2215, 9641, 13733, 48205, 68665, 137773, 688865, 4270963, 21354815]

約数ペア:

[(1, 21354815), (5, 4270963), (31, 688865), (155, 137773), (311, 68665), (443, 48205), (1555, 13733), (2215, 9641)]