20131340240 has 80 divisors (see below), whose sum is σ = 51082819776. Its totient is φ = 7317273600.

The previous prime is 20131340233. The next prime is 20131340261. The reversal of 20131340240 is 4204313102.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3068804 + ... + 3075356.

Almost surely, 2^20131340240 is an apocalyptic number.

20131340240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20131340240 is an abundant number, since it is smaller than the sum of its proper divisors (30951479536).

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

20131340240 is a wasteful number, since it uses less digits than its factorization.

20131340240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10068 (or 10062 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20131340240 its reverse (4204313102), we get a palindrome (24335653342).

The spelling of 20131340240 in words is "twenty billion, one hundred thirty-one million, three hundred forty thousand, two hundred forty".