521997

素因数分解:

$3^1\times 7^2\times {\mathrm{53}}^1\times {\mathrm{67}}^1$

素因数の和:137

約数の個数: 24

約数和(自身を含む): 837216

約数和(自身を除く): 315219

約数列:

[1, 3, 7, 21, 49, 53, 67, 147, 159, 201, 371, 469, 1113, 1407, 2597, 3283, 3551, 7791, 9849, 10653, 24857, 74571, 173999, 521997]

約数ペア:

[(1, 521997), (3, 173999), (7, 74571), (21, 24857), (49, 10653), (53, 9849), (67, 7791), (147, 3551), (159, 3283), (201, 2597), (371, 1407), (469, 1113)]