20731132 has 12 divisors (see below), whose sum is σ = 36334480.
Its totient is φ = 10349856.
The previous prime is 20731129. The next prime is 20731133. The reversal of 20731132 is 23113702.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20731133) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 657 + ... + 6472.
Almost surely, 220731132 is an apocalyptic number.
It is an amenable number.
20731132 is a deficient number, since it is larger than the sum of its proper divisors (15603348).
20731132 is a wasteful number, since it uses less digits than its factorization.
20731132 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7860 (or 7858 counting only the distinct ones).
The product of its (nonzero) digits is 252, while the sum is 19.
The square root of 20731132 is about 4553.1452865025.
The cubic root of 20731132 is about 274.7099178075.
Adding to 20731132 its reverse (23113702), we get a palindrome (43844834).
The spelling of 20731132 in words is "twenty million, seven hundred thirty-one thousand, one hundred thirty-two".