Is the abundance of the product of 2 consecutive integers (pronic numbers) bounded? What about the abundance of the product of 3 consecutive integers? What about $n$ consecutive integers? I wrote the following little Python script along the following lines to try and understand it better for the case $n=3$ (and I can generalize it), but I know that this is not a substitute for a proof. I found an abundance of approximately 3.294 for $54\times 55\times 56$, but nothing higher.
import math
import time
i=1
def abundance(n):
sum=0
i=1
while i<=(math.sqrt(n)):
if n%i==0:
if n/i==i:
sum=sum+i
else:
sum=sum+i
sum=sum+(n/i)
i=i+1
sum=sum-n
return sum/n
while True:
print("Abundance of "+str(i)+", "+str(i+1)+", and "+str(i+2)+" is "+str(abundance(i*(i+1)*(i+2))))
i+=1
time.sleep(0.5)
By the abundance of a positive integer $n$, I understand you to mean $\frac{\sigma(n)}{n}$ where $\sigma$ is the sum-of-divisors function.
Since the abundance of single integers is unbounded, so is the abundance of products of two (or more) consecutive integers, because in general: $\frac{\sigma(mn)}{mn}\ge \frac{\sigma(n)}{n}$
As pointed out by @Daniel Fischer (thank you!), OP is defining abundance where the sum of factors only includes proper factors (i.e., $n$ is excluded in the sum of factors of $n$). I am using the sum of all factors, including $n$. This means that my value of the abundance of an integer $n$ will always be exactly one greater than OP's value. However, the unboundedness argument I give is still valid.