20203120521 has 40 divisors (see below), whose sum is σ = 30715303080. Its totient is φ = 13232595456.

The previous prime is 20203120499. The next prime is 20203120529. The reversal of 20203120521 is 12502130202.

20203120521 is a `hidden beast` number, since 2 + 0 + 20 + 3 + 120 + 521 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 227255625 + 19975864896 = 15075^2 + 141336^2 .

It is not a de Polignac number, because 20203120521 - 2⁹ = 20203120009 is a prime.

It is a super-2 number, since 2×20203120521² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20203120494 and 20203120503.

It is not an unprimeable number, because it can be changed into a prime (20203120529) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 147467965 + ... + 147468101.

It is an arithmetic number, because the mean of its divisors is an integer number (767882577).

Almost surely, 2^20203120521 is an apocalyptic number.

It is an amenable number.

20203120521 is a deficient number, since it is larger than the sum of its proper divisors (10512182559).

20203120521 is an frugal number, since it uses more digits than its factorization.

20203120521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 20203120521 its reverse (12502130202), we get a palindrome (32705250723).

The spelling of 20203120521 in words is "twenty billion, two hundred three million, one hundred twenty thousand, five hundred twenty-one".