21220895

素因数分解:

$5^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{4721}}^1$

素因数の和:4786

約数の個数: 16

約数和(自身を含む): 27198720

約数和(自身を除く): 5977825

約数列:

[1, 5, 29, 31, 145, 155, 899, 4495, 4721, 23605, 136909, 146351, 684545, 731755, 4244179, 21220895]

約数ペア:

[(1, 21220895), (5, 4244179), (29, 731755), (31, 684545), (145, 146351), (155, 136909), (899, 23605), (4495, 4721)]