21387989

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{191}}^1\times {\mathrm{941}}^1$

素因数の和:1156

約数の個数: 16

約数和(自身を含む): 26044416

約数和(自身を除く): 4656427

約数列:

[1, 7, 17, 119, 191, 941, 1337, 3247, 6587, 15997, 22729, 111979, 179731, 1258117, 3055427, 21387989]

約数ペア:

[(1, 21387989), (7, 3055427), (17, 1258117), (119, 179731), (191, 111979), (941, 22729), (1337, 15997), (3247, 6587)]