21378513

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{401}}^1\times {\mathrm{1367}}^1$

素因数の和:1784

約数の個数: 16

約数和(自身を含む): 30796416

約数和(自身を除く): 9417903

約数列:

[1, 3, 13, 39, 401, 1203, 1367, 4101, 5213, 15639, 17771, 53313, 548167, 1644501, 7126171, 21378513]

約数ペア:

[(1, 21378513), (3, 7126171), (13, 1644501), (39, 548167), (401, 53313), (1203, 17771), (1367, 15639), (4101, 5213)]