20135057 has 4 divisors (see below), whose sum is σ = 20334516. Its totient is φ = 19935600.

The previous prime is 20135047. The next prime is 20135069. The reversal of 20135057 is 75053102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19704721 + 430336 = 4439^2 + 656^2 .

It is a cyclic number.

It is not a de Polignac number, because 20135057 - 2⁸ = 20134801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20135047) 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, 99578 + ... + 99779.

It is an arithmetic number, because the mean of its divisors is an integer number (5083629).

Almost surely, 2^20135057 is an apocalyptic number.

It is an amenable number.

20135057 is a deficient number, since it is larger than the sum of its proper divisors (199459).

20135057 is a wasteful number, since it uses less digits than its factorization.

20135057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199458.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 20135057 is about 4487.2103806263. The cubic root of 20135057 is about 272.0513932949.

Adding to 20135057 its reverse (75053102), we get a palindrome (95188159).

The spelling of 20135057 in words is "twenty million, one hundred thirty-five thousand, fifty-seven".