21208731

素因数分解:

$3^1\times {\mathrm{19}}^1\times {\mathrm{271}}^1\times {\mathrm{1373}}^1$

素因数の和:1666

約数の個数: 16

約数和(自身を含む): 29898240

約数和(自身を除く): 8689509

約数列:

[1, 3, 19, 57, 271, 813, 1373, 4119, 5149, 15447, 26087, 78261, 372083, 1116249, 7069577, 21208731]

約数ペア:

[(1, 21208731), (3, 7069577), (19, 1116249), (57, 372083), (271, 78261), (813, 26087), (1373, 15447), (4119, 5149)]