20104513 has 12 divisors (see below), whose sum is σ = 23800084. Its totient is φ = 16869600.

The previous prime is 20104499. The next prime is 20104531. The reversal of 20104513 is 31540102.

It can be written as a sum of positive squares in 2 ways, for example, as 8625969 + 11478544 = 2937^2 + 3388^2 .

It is not a de Polignac number, because 20104513 - 2²¹ = 18007361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20104313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4818 + ... + 7963.

Almost surely, 2^20104513 is an apocalyptic number.

It is an amenable number.

20104513 is a deficient number, since it is larger than the sum of its proper divisors (3695571).

20104513 is a wasteful number, since it uses less digits than its factorization.

20104513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12816 (or 12805 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20104513 is about 4483.8056380713. The cubic root of 20104513 is about 271.9137603257.

Adding to 20104513 its reverse (31540102), we get a palindrome (51644615).

The spelling of 20104513 in words is "twenty million, one hundred four thousand, five hundred thirteen".