20331136 has 32 divisors (see below), whose sum is σ = 46291680. Its totient is φ = 8712960.

The previous prime is 20331127. The next prime is 20331139. The reversal of 20331136 is 63113302.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331139) 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, 10450 + ... + 12241.

It is an arithmetic number, because the mean of its divisors is an integer number (1446615).

Almost surely, 2^20331136 is an apocalyptic number.

It is an amenable number.

20331136 is an abundant number, since it is smaller than the sum of its proper divisors (25960544).

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

20331136 is an equidigital number, since it uses as much as digits as its factorization.

20331136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22712 (or 22700 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 20331136 is about 4509.0060989092. The cubic root of 20331136 is about 272.9316381223.

Adding to 20331136 its reverse (63113302), we get a palindrome (83444438).

The spelling of 20331136 in words is "twenty million, three hundred thirty-one thousand, one hundred thirty-six".