The HP 20b Business Consultant (F2219A, codenamed "Little Euro"[6]) is a financial calculator published in 2008 by Hewlett-Packard.

The processor's serial interface is accessible from under the battery cover to allow the firmware to be updated using a special cable from HP.

The HP 20b contains functions similar to the HP 10bII, with financial functions including: TVM, IRR, NPV, NUS ("Net Uniform Series"[7]), amortization, depreciation, bonds, yield and accrued interest, interest conversion, list-based cashflow analysis, cashflows, break-even analysis.

Math/Statistics functions include: list-base, 1 and 2 variable statistics, mean, standard deviation, population deviation, standard error, forecasting, correlations and covariance, +, -, ×, ÷, %, 1/x, +/-, scientific notation, n!, combinations, permutations, rounding, random numbers, LOG, LN, 10×, PL, square root, trigonometry, probability.

Many users claim that they dislike the model because it lacks the feedback when pressing the keys, and the menus make things complicated.