Yes, @Amisha Rawat, now you can post 20 photos or a carousel post on Instagram to create more engagement on your profile. Previously, it was set to post only 10 photos, but now, after some time back the update allows us to publish 20 photos at the same time as posting on Instagram.
How to create a carousel post with 20 photos:
Open Instagram, tap on the plus sign.
Upload the first image, and then choose the carousel icon (or multiple images to upload more images).
You can add up to 20 images in your post.
Tap "Next" to edit your post.
Add any filters if you want, or individually edit single images into the carousel.
Tap the "Next" button again to finally edit your post with location, music, and captions.
Finally, click on the post to publish your carousel.