20132811 has 24 divisors (see below), whose sum is σ = 31004064. Its totient is φ = 12545280.

The previous prime is 20132803. The next prime is 20132813. The reversal of 20132811 is 11823102.

It is not a de Polignac number, because 20132811 - 2³ = 20132803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20132813) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27330 + ... + 28056.

It is an arithmetic number, because the mean of its divisors is an integer number (1291836).

Almost surely, 2^20132811 is an apocalyptic number.

20132811 is a deficient number, since it is larger than the sum of its proper divisors (10871253).

20132811 is a wasteful number, since it uses less digits than its factorization.

20132811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931 (or 928 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 20132811 is about 4486.9601067984. The cubic root of 20132811 is about 272.0412774366.

Adding to 20132811 its reverse (11823102), we get a palindrome (31955913).

The spelling of 20132811 in words is "twenty million, one hundred thirty-two thousand, eight hundred eleven".