21409815

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{29129}}^1$

素因数の和:29151

約数の個数: 24

約数和(自身を含む): 39849840

約数和(自身を除く): 18440025

約数列:

[1, 3, 5, 7, 15, 21, 35, 49, 105, 147, 245, 735, 29129, 87387, 145645, 203903, 436935, 611709, 1019515, 1427321, 3058545, 4281963, 7136605, 21409815]

約数ペア:

[(1, 21409815), (3, 7136605), (5, 4281963), (7, 3058545), (15, 1427321), (21, 1019515), (35, 611709), (49, 436935), (105, 203903), (147, 145645), (245, 87387), (735, 29129)]