204020513 has 4 divisors (see below), whose sum is σ = 204074928. Its totient is φ = 203966100.

The previous prime is 204020501. The next prime is 204020533. The reversal of 204020513 is 315020402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 315020402 = 2 ⋅157510201.

It is a cyclic number.

It is not a de Polignac number, because 204020513 - 2⁴ = 204020497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204020491 and 204020500.

It is not an unprimeable number, because it can be changed into a prime (204020533) 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 3 ways as a sum of consecutive naturals, for example, 21131 + ... + 29232.

It is an arithmetic number, because the mean of its divisors is an integer number (51018732).

Almost surely, 2^204020513 is an apocalyptic number.

It is an amenable number.

204020513 is a deficient number, since it is larger than the sum of its proper divisors (54415).

204020513 is an equidigital number, since it uses as much as digits as its factorization.

204020513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54414.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 204020513 is about 14283.5749376688. The cubic root of 204020513 is about 588.6962622716.

Adding to 204020513 its reverse (315020402), we get a palindrome (519040915).

The spelling of 204020513 in words is "two hundred four million, twenty thousand, five hundred thirteen".