20631332 has 12 divisors (see below), whose sum is σ = 36136716. Its totient is φ = 10306560.

The previous prime is 20631293. The next prime is 20631343. The reversal of 20631332 is 23313602.

It can be written as a sum of positive squares in 2 ways, for example, as 614656 + 20016676 = 784^2 + 4474^2 .

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7232 + ... + 9672.

It is an arithmetic number, because the mean of its divisors is an integer number (3011393).

Almost surely, 2^20631332 is an apocalyptic number.

It is an amenable number.

20631332 is a deficient number, since it is larger than the sum of its proper divisors (15505384).

20631332 is a wasteful number, since it uses less digits than its factorization.

20631332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4558 (or 4556 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 20631332 is about 4542.1726079047. The cubic root of 20631332 is about 274.2683892310.

Adding to 20631332 its reverse (23313602), we get a palindrome (43944934).

The spelling of 20631332 in words is "twenty million, six hundred thirty-one thousand, three hundred thirty-two".