Huawei P20 Pro has a pixel density of:
408.26

A.K.A.
Released: 2018

Resolution: 2244×1080 6.1″ display

Totaling 2.42mp (megapixels) and having a PPI of 408.26

Category: Phone
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Huawei P20 and P20 Pro

Huawei P20 Pro in “Twilight”.
Manufacturer	Huawei
Slogan	Make every shot a cover shot
Series	Huawei P series
First released	March 27, 2018; 11 months ago (2018-03-27)
Predecessor	Huawei P10
Type	Smartphone
Form factor	Slate
Operating system	Original: Android 8.1 “Oreo” Current: Android 9.0 “Pie”[1]
System on chip	Kirin 970
CPU	Octa-core (4×2.4 GHz Cortex-A73 & 4×1.8 GHz Cortex-A53)
GPU	Mali-G72 MP12
Memory	P20: 4 GB LPDDR4X RAM P20 Pro: 6 GB LPDDR4X RAM
Storage	128 GB
Battery	P20: 3400 mAh P20 Pro: 4000 mAh
Display	P20: 5.84 in (148 mm) 1080×2244 LTPS LCD, ~432ppi pixel density P20 Pro: 6.1 in (150 mm) 1080×2244 AMOLED, 408ppi pixel density
Rear camera	P20: Dual: 20 MP Monochrome (f/1.6, 1/2.3″, 1.55 µm, OIS) + 12 MP RGB (f/1.8, 27mm), Leica optics, 2x optical zoom, phase detection and laser AF, dual-LED dual-tone flash P20 Pro: Triple: 40 MP RGB (f/1.8, 1/1.7″, OIS) + 20 MP Monochrome (f/1.6) + 8 MP RGB Telephoto (f/2.4), Leica optics, 3x optical zoom, phase detection and laser AF, dual-LED dual-tone flash
Front camera	24 MP, autofocus, f/2.0, 1080p video
Other	GPS, GLONASS, Galileo, BeiDou
Website	Official website (P20) Official website (P20 Pro)

This righthand infobox courtesy of Wikipedia.