20205135 has 12 divisors (see below), whose sum is σ = 35022312. Its totient is φ = 10776048.

The previous prime is 20205121. The next prime is 20205139. The reversal of 20205135 is 53150202.

It is a happy number.

It is not a de Polignac number, because 20205135 - 2⁵ = 20205103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205139) 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 11 ways as a sum of consecutive naturals, for example, 224457 + ... + 224546.

It is an arithmetic number, because the mean of its divisors is an integer number (2918526).

Almost surely, 2^20205135 is an apocalyptic number.

20205135 is a deficient number, since it is larger than the sum of its proper divisors (14817177).

20205135 is a wasteful number, since it uses less digits than its factorization.

20205135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449014 (or 449011 counting only the distinct ones).

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

The square root of 20205135 is about 4495.0122358009. The cubic root of 20205135 is about 272.3666434991.

Adding to 20205135 its reverse (53150202), we get a palindrome (73355337).

The spelling of 20205135 in words is "twenty million, two hundred five thousand, one hundred thirty-five".