20511132 has 12 divisors (see below), whose sum is σ = 47859336. Its totient is φ = 6837040.

The previous prime is 20511131. The next prime is 20511143. The reversal of 20511132 is 23111502.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20511131) 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, 854619 + ... + 854642.

It is an arithmetic number, because the mean of its divisors is an integer number (3988278).

Almost surely, 2^20511132 is an apocalyptic number.

It is an amenable number.

20511132 is an abundant number, since it is smaller than the sum of its proper divisors (27348204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20511132 is a wasteful number, since it uses less digits than its factorization.

20511132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709268 (or 1709266 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20511132 is about 4528.9217259741. The cubic root of 20511132 is about 273.7347140190.

Adding to 20511132 its reverse (23111502), we get a palindrome (43622634).

The spelling of 20511132 in words is "twenty million, five hundred eleven thousand, one hundred thirty-two".