20731332 has 24 divisors (see below), whose sum is σ = 49499296.
Its totient is φ = 6749568.
The previous prime is 20731327. The next prime is 20731339. The reversal of 20731332 is 23313702.
It is a junction number, because it is equal to n+sod(n) for n = 20731299 and 20731308.
It is not an unprimeable number, because it can be changed into a prime (20731339) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19573 + ... + 20604.
Almost surely, 220731332 is an apocalyptic number.
It is an amenable number.
20731332 is an abundant number, since it is smaller than the sum of its proper divisors (28767964).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20731332 is a wasteful number, since it uses less digits than its factorization.
20731332 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 40227 (or 40225 counting only the distinct ones).
The product of its (nonzero) digits is 756, while the sum is 21.
The square root of 20731332 is about 4553.1672492892.
The cubic root of 20731332 is about 274.7108012101.
The spelling of 20731332 in words is "twenty million, seven hundred thirty-one thousand, three hundred thirty-two".