When do you think the US Debt will hit 20 trillion dollars?

[GunnyFreedom]

Gdp to debt ratio is the important number, not the actual nominal amount.

Sure, that's a factor. But there are other factors, like the composition of the GDP being used in that ratio. Some components of the GDP are non-productive, such as government spending. The ratio of debt to GDP is pretty telling in and of itself:

But when you also account for the net change in the composition of the GDP, it becomes downright scary:

Here, then is the ratio separated by each component: