21153979

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{6389}}^1$

素因数の和:6450

約数の個数: 16

約数和(自身を含む): 26991360

約数和(自身を除く): 5837381

約数列:

[1, 7, 11, 43, 77, 301, 473, 3311, 6389, 44723, 70279, 274727, 491953, 1923089, 3021997, 21153979]

約数ペア:

[(1, 21153979), (7, 3021997), (11, 1923089), (43, 491953), (77, 274727), (301, 70279), (473, 44723), (3311, 6389)]