21505701

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{53899}}^1$

素因数の和:53928

約数の個数: 16

約数和(自身を含む): 34496000

約数和(自身を除く): 12990299

約数列:

[1, 3, 7, 19, 21, 57, 133, 399, 53899, 161697, 377293, 1024081, 1131879, 3072243, 7168567, 21505701]

約数ペア:

[(1, 21505701), (3, 7168567), (7, 3072243), (19, 1131879), (21, 1024081), (57, 377293), (133, 161697), (399, 53899)]