20531155244 has 24 divisors (see below), whose sum is σ = 36862928928. Its totient is φ = 9999666560.

The previous prime is 20531155237. The next prime is 20531155247. The reversal of 20531155244 is 44255113502.

It is a self number, because there is not a number n which added to its sum of digits gives 20531155244.

It is not an unprimeable number, because it can be changed into a prime (20531155247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9362 + ... + 202854.

It is an arithmetic number, because the mean of its divisors is an integer number (1535955372).

Almost surely, 2^20531155244 is an apocalyptic number.

It is an amenable number.

20531155244 is a deficient number, since it is larger than the sum of its proper divisors (16331773684).

20531155244 is a wasteful number, since it uses less digits than its factorization.

20531155244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194185 (or 194183 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 20531155244 its reverse (44255113502), we get a palindrome (64786268746).

The spelling of 20531155244 in words is "twenty billion, five hundred thirty-one million, one hundred fifty-five thousand, two hundred forty-four".