21397971

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{53629}}^1$

素因数の和:53658

約数の個数: 16

約数和(自身を含む): 34323200

約数和(自身を除く): 12925229

約数列:

[1, 3, 7, 19, 21, 57, 133, 399, 53629, 160887, 375403, 1018951, 1126209, 3056853, 7132657, 21397971]

約数ペア:

[(1, 21397971), (3, 7132657), (7, 3056853), (19, 1126209), (21, 1018951), (57, 375403), (133, 160887), (399, 53629)]