20031136 has 24 divisors (see below), whose sum is σ = 39584160. Its totient is φ = 9978048.

The previous prime is 20031103. The next prime is 20031139. The reversal of 20031136 is 63113002.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (20031139) 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, 8805 + ... + 10843.

It is an arithmetic number, because the mean of its divisors is an integer number (1649340).

Almost surely, 2^20031136 is an apocalyptic number.

It is an amenable number.

20031136 is a deficient number, since it is larger than the sum of its proper divisors (19553024).

20031136 is a wasteful number, since it uses less digits than its factorization.

20031136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356 (or 2348 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 20031136 is about 4475.6157118323. The cubic root of 20031136 is about 271.5825488038.

Adding to 20031136 its reverse (63113002), we get a palindrome (83144138).

The spelling of 20031136 in words is "twenty million, thirty-one thousand, one hundred thirty-six".