20810135 has 4 divisors (see below), whose sum is σ = 24972168. Its totient is φ = 16648104.

The previous prime is 20810129. The next prime is 20810177. The reversal of 20810135 is 53101802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20810135 - 2⁶ = 20810071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2081009 + ... + 2081018.

It is an arithmetic number, because the mean of its divisors is an integer number (6243042).

Almost surely, 2^20810135 is an apocalyptic number.

20810135 is a deficient number, since it is larger than the sum of its proper divisors (4162033).

20810135 is an equidigital number, since it uses as much as digits as its factorization.

20810135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4162032.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 20810135 is about 4561.8126879564. The cubic root of 20810135 is about 275.0584338637.

Adding to 20810135 its reverse (53101802), we get a palindrome (73911937).

The spelling of 20810135 in words is "twenty million, eight hundred ten thousand, one hundred thirty-five".