20112521 has 24 divisors (see below), whose sum is σ = 24595200. Its totient is φ = 16286400.

The previous prime is 20112517. The next prime is 20112523. The reversal of 20112521 is 12521102.

It is not a de Polignac number, because 20112521 - 2² = 20112517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20112496 and 20112505.

It is not an unprimeable number, because it can be changed into a prime (20112523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57455 + ... + 57803.

It is an arithmetic number, because the mean of its divisors is an integer number (1024800).

Almost surely, 2^20112521 is an apocalyptic number.

It is an amenable number.

20112521 is a deficient number, since it is larger than the sum of its proper divisors (4482679).

20112521 is a wasteful number, since it uses less digits than its factorization.

20112521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 20112521 is about 4484.6985405933. The cubic root of 20112521 is about 271.9498582961.

Adding to 20112521 its reverse (12521102), we get a palindrome (32633623).

The spelling of 20112521 in words is "twenty million, one hundred twelve thousand, five hundred twenty-one".