21516831

素因数分解:

$3^2\times 7^2\times {\mathrm{97}}^1\times {\mathrm{503}}^1$

素因数の和:620

約数の個数: 36

約数和(自身を含む): 36599472

約数和(自身を除く): 15082641

約数列:

[1, 3, 7, 9, 21, 49, 63, 97, 147, 291, 441, 503, 679, 873, 1509, 2037, 3521, 4527, 4753, 6111, 10563, 14259, 24647, 31689, 42777, 48791, 73941, 146373, 221823, 341537, 439119, 1024611, 2390759, 3073833, 7172277, 21516831]

約数ペア:

[(1, 21516831), (3, 7172277), (7, 3073833), (9, 2390759), (21, 1024611), (49, 439119), (63, 341537), (97, 221823), (147, 146373), (291, 73941), (441, 48791), (503, 42777), (679, 31689), (873, 24647), (1509, 14259), (2037, 10563), (3521, 6111), (4527, 4753)]