It is a congruent number.
It is an unprimeable number.
Almost surely, 220553000 is an apocalyptic number.
20553000 is a gapful number since it is divisible by the number (20) 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 20553000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37739520).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20553000 is a wasteful number, since it uses less digits than its factorization.
20553000 is an evil number, because the sum of its binary digits is even.
The square root of 20553000 is about 4533.5416618798. The cubic root of 20553000 is about 273.9208395472.
Adding to 20553000 its reverse (35502), we get a palindrome (20588502).
The spelling of 20553000 in words is "twenty million, five hundred fifty-three thousand".