21778813

素因数分解:

$7^1\times {\mathrm{47}}^1\times {\mathrm{53}}^1\times {\mathrm{1249}}^1$

素因数の和:1356

約数の個数: 16

約数和(自身を含む): 25920000

約数和(自身を除く): 4141187

約数列:

[1, 7, 47, 53, 329, 371, 1249, 2491, 8743, 17437, 58703, 66197, 410921, 463379, 3111259, 21778813]

約数ペア:

[(1, 21778813), (7, 3111259), (47, 463379), (53, 410921), (329, 66197), (371, 58703), (1249, 17437), (2491, 8743)]