20131423552 has 56 divisors (see below), whose sum is σ = 42078046400. Its totient is φ = 9529767936.

The previous prime is 20131423537. The next prime is 20131423561. The reversal of 20131423552 is 25532413102.

It is a self number, because there is not a number n which added to its sum of digits gives 20131423552.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2273149 + ... + 2281987.

Almost surely, 2^20131423552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20131423552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21039023200).

20131423552 is an abundant number, since it is smaller than the sum of its proper divisors (21946622848).

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

20131423552 is a wasteful number, since it uses less digits than its factorization.

20131423552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10743 (or 10733 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 20131423552 its reverse (25532413102), we get a palindrome (45663836654).

The spelling of 20131423552 in words is "twenty billion, one hundred thirty-one million, four hundred twenty-three thousand, five hundred fifty-two".