20818135 has 16 divisors (see below), whose sum is σ = 27415584. Its totient is φ = 15080832.

The previous prime is 20818121. The next prime is 20818139. The reversal of 20818135 is 53181802.

It is not a de Polignac number, because 20818135 - 2⁹ = 20817623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20818139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 424 + ... + 6466.

It is an arithmetic number, because the mean of its divisors is an integer number (1713474).

Almost surely, 2^20818135 is an apocalyptic number.

20818135 is a deficient number, since it is larger than the sum of its proper divisors (6597449).

20818135 is a wasteful number, since it uses less digits than its factorization.

20818135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6114.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 20818135 is about 4562.6894481216. The cubic root of 20818135 is about 275.0936760755.

Adding to 20818135 its reverse (53181802), we get a palindrome (73999937).

The spelling of 20818135 in words is "twenty million, eight hundred eighteen thousand, one hundred thirty-five".