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I should probably re-up this now that there *really are* 20 Democrats running. 53eig.ht/2GGuiVq
The key takeaway is there's a fairly strong (& intuitive) empirical relationship between how many candidates run, and how much of the vote the top candidate gets across all primaries and caucuses. In a fields this large, you probably wouldn't expect the top candidate to get 50%+. 
And under Democrats' current rules, if you don't get close to 50% of the *vote*, it's hard to get 50% of the first-ballot *delegates*, which means you go to a second ballot (at least nominally a contested convention!) where superdelegates can weigh in after all.
