21209019

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{12647}}^1$

素因数の和:12706

約数の個数: 16

約数和(自身を含む): 31164672

約数和(自身を除く): 9955653

約数列:

[1, 3, 13, 39, 43, 129, 559, 1677, 12647, 37941, 164411, 493233, 543821, 1631463, 7069673, 21209019]

約数ペア:

[(1, 21209019), (3, 7069673), (13, 1631463), (39, 543821), (43, 493233), (129, 164411), (559, 37941), (1677, 12647)]