20521232 has 10 divisors (see below), whose sum is σ = 39759918. Its totient is φ = 10260608.

The previous prime is 20521217. The next prime is 20521253. The reversal of 20521232 is 23212502.

It can be written as a sum of positive squares in only one way, i.e., 18627856 + 1893376 = 4316^2 + 1376^2 .

It is a super-2 number, since 2×20521232² = 842241925595648, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20521232.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641273 + ... + 641304.

Almost surely, 2^20521232 is an apocalyptic number.

It is an amenable number.

20521232 is a deficient number, since it is larger than the sum of its proper divisors (19238686).

20521232 is a wasteful number, since it uses less digits than its factorization.

20521232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282585 (or 1282579 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20521232 is about 4530.0366444434. The cubic root of 20521232 is about 273.7796370546.

Adding to 20521232 its reverse (23212502), we get a palindrome (43733734).

The spelling of 20521232 in words is "twenty million, five hundred twenty-one thousand, two hundred thirty-two".