20135156 has 6 divisors (see below), whose sum is σ = 35236530. Its totient is φ = 10067576.

The previous prime is 20135147. The next prime is 20135183. The reversal of 20135156 is 65153102.

It can be written as a sum of positive squares in only one way, i.e., 20106256 + 28900 = 4484^2 + 170^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2516891 + ... + 2516898.

It is an arithmetic number, because the mean of its divisors is an integer number (5872755).

Almost surely, 2^20135156 is an apocalyptic number.

It is an amenable number.

20135156 is a deficient number, since it is larger than the sum of its proper divisors (15101374).

20135156 is a wasteful number, since it uses less digits than its factorization.

20135156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5033793 (or 5033791 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 20135156 is about 4487.2214119653. The cubic root of 20135156 is about 272.0518391680.

Adding to 20135156 its reverse (65153102), we get a palindrome (85288258).

The spelling of 20135156 in words is "twenty million, one hundred thirty-five thousand, one hundred fifty-six".