20135181 has 8 divisors (see below), whose sum is σ = 29287584. Its totient is φ = 12203120.

The previous prime is 20135147. The next prime is 20135183. The reversal of 20135181 is 18153102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20135181 - 2⁹ = 20134669 is a prime.

It is a super-2 number, since 2×20135181² = 810851027805522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20135183) 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 7 ways as a sum of consecutive naturals, for example, 305046 + ... + 305111.

It is an arithmetic number, because the mean of its divisors is an integer number (3660948).

Almost surely, 2^20135181 is an apocalyptic number.

It is an amenable number.

20135181 is a deficient number, since it is larger than the sum of its proper divisors (9152403).

20135181 is a wasteful number, since it uses less digits than its factorization.

20135181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610171.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 20135181 is about 4487.2241976527. The cubic root of 20135181 is about 272.0519517620.

Adding to 20135181 its reverse (18153102), we get a palindrome (38288283).

The spelling of 20135181 in words is "twenty million, one hundred thirty-five thousand, one hundred eighty-one".