21516047

素因数分解:

$7^3\times {\mathrm{149}}^1\times {\mathrm{421}}^1$

素因数の和:591

約数の個数: 16

約数和(自身を含む): 25320000

約数和(自身を除く): 3803953

約数列:

[1, 7, 49, 149, 343, 421, 1043, 2947, 7301, 20629, 51107, 62729, 144403, 439103, 3073721, 21516047]

約数ペア:

[(1, 21516047), (7, 3073721), (49, 439103), (149, 144403), (343, 62729), (421, 51107), (1043, 20629), (2947, 7301)]