Revelation 9:16

And the number of the mounted troops was two hundred million. This number designates the deceptive duplicity of the perverse army. Which another translation, saying "twice ten thousand times ten thousand," can be more easily understood; and this number is also opposed by the evangelical parable to the king having ten thousand (Matt. IV), as the duplicity of the wicked resists the simple faith of Christ, to whom thousands of thousands minister and ten thousand times ten thousand stand (Dan. VII).

And the number of the army of horsemen was twenty thousand times ten thousand. I heard the number of them. This number refers specifically to preachers of errors, but in such a way that the seduced people are also understood in the seducers. We see that this number coming against the number of the elect is both double and multiplied by two thousand; for it is said about the elect, The chariot of God is ten thousands, [Variant of Ps. 67:18] and about these people, twenty thousand times ten thousand. It is double, then, because it consists of evil spirits and reprobate men. There remains therefore for the twofold evil to be fought against by the onefold good.

"The number of that cavalry was eighty thousand." … He again uses different ways to suggest the whole body of evil persons. Here it says eighty thousand. Just as through the perfection of the number six, he signifies for us the form of sixty good people, so that we read "there were sixty queens," so sometimes the number eighty is used in a bad sense. [Eighty] arises from that which is fourfold, on account of the four well-known qualities of the body—cold and heat, moisture and dryness—or on account of the four passions that often vex humans in life—dread, desire, pain and joy. When these four are doubled because of the two sexes, they become eight. This number similarly increasing by way of tens makes eighty, and in some way this shows that portion of evil persons who as cavalry fight against the body of Christ, which is the church. Therefore, that verse continued, "there are eighty concubines," as though they were not united by a legitimate union but by a fraudulent one. And this is characteristic of all heresies that lay hold of the sacraments of faith for a time while they are clothed in the name of Christ. Yet just like concubines who do not remain permanently in the home, they desire to profit from the name of Christ by gaining influence or advantage or authority or human praise.… Tyconius comments upon another translation, "And the number of soldiers was twice ten thousand times ten thousand." … It seems to us that also in this translation the portion of the people of perdition are aptly indicated. For twice ten thousand is twenty thousand, and this is the number which the Lord in the Gospel placed against the king who had ten thousand, so that, as it were, the duplicity of those who are evil opposes the simplicity of the Christians.