It is a congruent number.
It is an unprimeable number.
Almost surely, 213245720 is an apocalyptic number.
13245720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 13245720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21669120).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
13245720 is a wasteful number, since it uses less digits than its factorization.
13245720 is an evil number, because the sum of its binary digits is even.
The square root of 13245720 is about 3639.4669939429. The cubic root of 13245720 is about 236.6056930363.
Adding to 13245720 its reverse (2754231), we get a palindrome (15999951).
The spelling of 13245720 in words is "thirteen million, two hundred forty-five thousand, seven hundred twenty".