21705789

素因数分解:

$3^1\times 7^1\times {\mathrm{67}}^1\times {\mathrm{15427}}^1$

素因数の和:15504

約数の個数: 16

約数和(自身を含む): 33571328

約数和(自身を除く): 11865539

約数列:

[1, 3, 7, 21, 67, 201, 469, 1407, 15427, 46281, 107989, 323967, 1033609, 3100827, 7235263, 21705789]

約数ペア:

[(1, 21705789), (3, 7235263), (7, 3100827), (21, 1033609), (67, 323967), (201, 107989), (469, 46281), (1407, 15427)]