20731135 has 4 divisors (see below), whose sum is σ = 24877368. Its totient is φ = 16584904.

The previous prime is 20731133. The next prime is 20731153. The reversal of 20731135 is 53113702.

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 20731135 - 2¹ = 20731133 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 (20731133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2073109 + ... + 2073118.

It is an arithmetic number, because the mean of its divisors is an integer number (6219342).

Almost surely, 2^20731135 is an apocalyptic number.

20731135 is a deficient number, since it is larger than the sum of its proper divisors (4146233).

20731135 is an equidigital number, since it uses as much as digits as its factorization.

20731135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4146232.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 20731135 is about 4553.1456159451. The cubic root of 20731135 is about 274.7099310586.

Adding to 20731135 its reverse (53113702), we get a palindrome (73844837).

The spelling of 20731135 in words is "twenty million, seven hundred thirty-one thousand, one hundred thirty-five".