20531134120 has 64 divisors (see below), whose sum is σ = 52852953600. Its totient is φ = 7031431680.

The previous prime is 20531134111. The next prime is 20531134121. The reversal of 20531134120 is 2143113502.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20531134091 and 20531134100.

It is not an unprimeable number, because it can be changed into a prime (20531134121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214836 + ... + 295324.

It is an arithmetic number, because the mean of its divisors is an integer number (825827400).

Almost surely, 2^20531134120 is an apocalyptic number.

20531134120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20531134120 is an abundant number, since it is smaller than the sum of its proper divisors (32321819480).

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

20531134120 is a wasteful number, since it uses less digits than its factorization.

20531134120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81418 (or 81414 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 20531134120 its reverse (2143113502), we get a palindrome (22674247622).

The spelling of 20531134120 in words is "twenty billion, five hundred thirty-one million, one hundred thirty-four thousand, one hundred twenty".