20131254520 has 96 divisors (see below), whose sum is σ = 50135349600. Its totient is φ = 7231928832.

The previous prime is 20131254467. The next prime is 20131254571. The reversal of 20131254520 is 2545213102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 697741 + ... + 726019.

It is an arithmetic number, because the mean of its divisors is an integer number (522243225).

Almost surely, 2^20131254520 is an apocalyptic number.

20131254520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20131254520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25067674800).

20131254520 is an abundant number, since it is smaller than the sum of its proper divisors (30004095080).

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

20131254520 is a wasteful number, since it uses less digits than its factorization.

20131254520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28377 (or 28336 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 20131254520 its reverse (2545213102), we get a palindrome (22676467622).

The spelling of 20131254520 in words is "twenty billion, one hundred thirty-one million, two hundred fifty-four thousand, five hundred twenty".