21396815

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{563}}^1\times {\mathrm{691}}^1$

素因数の和:1270

約数の個数: 16

約数和(自身を含む): 28100736

約数和(自身を除く): 6703921

約数列:

[1, 5, 11, 55, 563, 691, 2815, 3455, 6193, 7601, 30965, 38005, 389033, 1945165, 4279363, 21396815]

約数ペア:

[(1, 21396815), (5, 4279363), (11, 1945165), (55, 389033), (563, 38005), (691, 30965), (2815, 7601), (3455, 6193)]