20531231252 has 12 divisors (see below), whose sum is σ = 41062462560. Its totient is φ = 8799099096.

The previous prime is 20531231251. The next prime is 20531231257. The reversal of 20531231252 is 25213213502.

It is a happy number.

20531231252 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531231251) 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, 366629102 + ... + 366629157.

It is an arithmetic number, because the mean of its divisors is an integer number (3421871880).

Almost surely, 2^20531231252 is an apocalyptic number.

It is an amenable number.

20531231252 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20531231252 is a wasteful number, since it uses less digits than its factorization.

20531231252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733258270 (or 733258268 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 20531231252 its reverse (25213213502), we get a palindrome (45744444754).

The spelling of 20531231252 in words is "twenty billion, five hundred thirty-one million, two hundred thirty-one thousand, two hundred fifty-two".