21520219

素因数分解:

$7^1\times {\mathrm{47}}^1\times {\mathrm{149}}^1\times {\mathrm{439}}^1$

素因数の和:642

約数の個数: 16

約数和(自身を含む): 25344000

約数和(自身を除く): 3823781

約数列:

[1, 7, 47, 149, 329, 439, 1043, 3073, 7003, 20633, 49021, 65411, 144431, 457877, 3074317, 21520219]

約数ペア:

[(1, 21520219), (7, 3074317), (47, 457877), (149, 144431), (329, 65411), (439, 49021), (1043, 20633), (3073, 7003)]