20131530540 has 192 divisors, whose sum is σ = 64698213888. Its totient is φ = 4632422400.

The previous prime is 20131530527. The next prime is 20131530553. The reversal of 20131530540 is 4503513102.

It is an interprime number because it is at equal distance from previous prime (20131530527) and next prime (20131530553).

It is a self number, because there is not a number n which added to its sum of digits gives 20131530540.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 991167 + ... + 1011273.

It is an arithmetic number, because the mean of its divisors is an integer number (336969864).

Almost surely, 2^20131530540 is an apocalyptic number.

20131530540 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 20131530540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32349106944).

20131530540 is an abundant number, since it is smaller than the sum of its proper divisors (44566683348).

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

20131530540 is a wasteful number, since it uses less digits than its factorization.

20131530540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20208 (or 20206 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The spelling of 20131530540 in words is "twenty billion, one hundred thirty-one million, five hundred thirty thousand, five hundred forty".