20521252 has 24 divisors (see below), whose sum is σ = 36733536. Its totient is φ = 10028928.

The previous prime is 20521217. The next prime is 20521253. The reversal of 20521252 is 25212502.

It is a super-2 number, since 2×20521252² = 842243567295008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20521253) 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, 37243 + ... + 37789.

It is an arithmetic number, because the mean of its divisors is an integer number (1530564).

Almost surely, 2^20521252 is an apocalyptic number.

It is an amenable number.

20521252 is a deficient number, since it is larger than the sum of its proper divisors (16212284).

20521252 is a wasteful number, since it uses less digits than its factorization.

20521252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747 (or 745 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 20521252 is about 4530.0388519305. The cubic root of 20521252 is about 273.7797259964.

Adding to 20521252 its reverse (25212502), we get a palindrome (45733754).

The spelling of 20521252 in words is "twenty million, five hundred twenty-one thousand, two hundred fifty-two".