20120023400240 has 80 divisors (see below), whose sum is σ = 47479619419392. Its totient is φ = 7927494043392.

The previous prime is 20120023400189. The next prime is 20120023400263. The reversal of 20120023400240 is 4200432002102.

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 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, 122163227 + ... + 122327813.

Almost surely, 2^{20120023400240} is an apocalyptic number.

20120023400240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20120023400240 is an abundant number, since it is smaller than the sum of its proper divisors (27359596019152).

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

20120023400240 is a wasteful number, since it uses less digits than its factorization.

20120023400240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187474 (or 187468 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20120023400240 its reverse (4200432002102), we get a palindrome (24320455402342).

The spelling of 20120023400240 in words is "twenty trillion, one hundred twenty billion, twenty-three million, four hundred thousand, two hundred forty".