20115232540 has 48 divisors (see below), whose sum is σ = 45563837760. Its totient is φ = 7415331840.

The previous prime is 20115232523. The next prime is 20115232547. The reversal of 20115232540 is 4523251102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20115232547) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 102756 + ... + 225364.

It is an arithmetic number, because the mean of its divisors is an integer number (949246620).

Almost surely, 2^20115232540 is an apocalyptic number.

20115232540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20115232540 is an abundant number, since it is smaller than the sum of its proper divisors (25448605220).

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

20115232540 is a wasteful number, since it uses less digits than its factorization.

20115232540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123262 (or 123260 counting only the distinct ones).

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

Adding to 20115232540 its reverse (4523251102), we get a palindrome (24638483642).

The spelling of 20115232540 in words is "twenty billion, one hundred fifteen million, two hundred thirty-two thousand, five hundred forty".