21128051

素因数分解:

$7^1\times {\mathrm{47}}^1\times {\mathrm{149}}^1\times {\mathrm{431}}^1$

素因数の和:634

約数の個数: 16

約数和(自身を含む): 24883200

約数和(自身を除く): 3755149

約数列:

[1, 7, 47, 149, 329, 431, 1043, 3017, 7003, 20257, 49021, 64219, 141799, 449533, 3018293, 21128051]

約数ペア:

[(1, 21128051), (7, 3018293), (47, 449533), (149, 141799), (329, 64219), (431, 49021), (1043, 20257), (3017, 7003)]