21209079

素因数分解:

$3^1\times {\mathrm{47}}^1\times {\mathrm{349}}^1\times {\mathrm{431}}^1$

素因数の和:830

約数の個数: 16

約数和(自身を含む): 29030400

約数和(自身を除く): 7821321

約数列:

[1, 3, 47, 141, 349, 431, 1047, 1293, 16403, 20257, 49209, 60771, 150419, 451257, 7069693, 21209079]

約数ペア:

[(1, 21209079), (3, 7069693), (47, 451257), (141, 150419), (349, 60771), (431, 49209), (1047, 20257), (1293, 16403)]