The summary of facts for the case said 17 of the charges were representative, meaning the offences against that person were committed on more than one occasion, and in one case 11 times.
Burrows gave some of the victims money, food, alcohol or cannabis or other items such as video games and concert tickets.
He met a 13-year-old boy through a social dating app.
He got some of the boys to send him naked pictures, with the offending happening between 2012 and 2018, when one of the boys reported him to police.
Burrows was arrested in September 2018 at Auckland Airport after returning from a trip to Canada.
When arrested and interviewed by police, Burrows declined to comment.
For the wilfully attempting to obstruct the course of justice charge Burrows contacted the boy who made the complaint to police and got him to delete naked photographs of the victim and Burrows from the victim's phone.
Crown Prosecutor Richard Annandale asked for a full pre-sentence report to be done before Burrow's sentencing.
Justice Brewer said due to Covid restrictions, which prevented judges travelling out of Auckland, he could not set a firm date for sentencing and instead remanded Burrows in custody for a callover in the High Court at Whangārei on October 21.
Justice Brewer convicted Burrows and issued him with a first strike warning under the Three Strikes legislation. This means that if Burrows is convicted of another serious violent offence - except murder - he will have to serve the full term of that sentence.
If he is convicted of murder he will have to serve the full life term imprisonment, unless it would be manifestly unjust to impose that sentence.