21201681

素因数分解:

$3^1\times {\mathrm{67}}^1\times {\mathrm{313}}^1\times {\mathrm{337}}^1$

素因数の和:720

約数の個数: 16

約数和(自身を含む): 28867904

約数和(自身を除く): 7666223

約数列:

[1, 3, 67, 201, 313, 337, 939, 1011, 20971, 22579, 62913, 67737, 105481, 316443, 7067227, 21201681]

約数ペア:

[(1, 21201681), (3, 7067227), (67, 316443), (201, 105481), (313, 67737), (337, 62913), (939, 22579), (1011, 20971)]