21253215

素因数分解:

$3^1\times 5^1\times {\mathrm{1151}}^1\times {\mathrm{1231}}^1$

素因数の和:2390

約数の個数: 16

約数和(自身を含む): 34062336

約数和(自身を除く): 12809121

約数列:

[1, 3, 5, 15, 1151, 1231, 3453, 3693, 5755, 6155, 17265, 18465, 1416881, 4250643, 7084405, 21253215]

約数ペア:

[(1, 21253215), (3, 7084405), (5, 4250643), (15, 1416881), (1151, 18465), (1231, 17265), (3453, 6155), (3693, 5755)]