20521244 has 24 divisors (see below), whose sum is σ = 39680928. Its totient is φ = 9236480.

The previous prime is 20521217. The next prime is 20521253. The reversal of 20521244 is 44212502.

It is a happy number.

It is a super-2 number, since 2×20521244² = 842242910615072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4997 + ... + 8124.

It is an arithmetic number, because the mean of its divisors is an integer number (1653372).

Almost surely, 2^20521244 is an apocalyptic number.

It is an amenable number.

20521244 is a deficient number, since it is larger than the sum of its proper divisors (19159684).

20521244 is a wasteful number, since it uses less digits than its factorization.

20521244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13165 (or 13163 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 20521244 is about 4530.0379689358. The cubic root of 20521244 is about 273.7796904197.

Adding to 20521244 its reverse (44212502), we get a palindrome (64733746).

The spelling of 20521244 in words is "twenty million, five hundred twenty-one thousand, two hundred forty-four".