20053521 has 8 divisors (see below), whose sum is σ = 29708960. Its totient is φ = 13368996.

The previous prime is 20053513. The next prime is 20053541. The reversal of 20053521 is 12535002.

It is a happy number.

It is not a de Polignac number, because 20053521 - 2³ = 20053513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20053494 and 20053503.

It is not an unprimeable number, because it can be changed into a prime (20053541) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 371335 + ... + 371388.

It is an arithmetic number, because the mean of its divisors is an integer number (3713620).

Almost surely, 2^20053521 is an apocalyptic number.

It is an amenable number.

20053521 is a deficient number, since it is larger than the sum of its proper divisors (9655439).

20053521 is an equidigital number, since it uses as much as digits as its factorization.

20053521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742732 (or 742726 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20053521 is about 4478.1157868014. The cubic root of 20053521 is about 271.6836765709.

Adding to 20053521 its reverse (12535002), we get a palindrome (32588523).

The spelling of 20053521 in words is "twenty million, fifty-three thousand, five hundred twenty-one".