21157689

素因数分解:

$3^1\times 7^1\times {\mathrm{503}}^1\times {\mathrm{2003}}^1$

素因数の和:2516

約数の個数: 16

約数和(自身を含む): 32320512

約数和(自身を除く): 11162823

約数列:

[1, 3, 7, 21, 503, 1509, 2003, 3521, 6009, 10563, 14021, 42063, 1007509, 3022527, 7052563, 21157689]

約数ペア:

[(1, 21157689), (3, 7052563), (7, 3022527), (21, 1007509), (503, 42063), (1509, 14021), (2003, 10563), (3521, 6009)]