12040400020 has 24 divisors (see below), whose sum is σ = 27583462368. Its totient is φ = 4378327200.

The previous prime is 12040399993. The next prime is 12040400023. The reversal of 12040400020 is 2000404021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12040400023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27364326 + ... + 27364765.

It is an arithmetic number, because the mean of its divisors is an integer number (1149310932).

Almost surely, 2^12040400020 is an apocalyptic number.

12040400020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12040400020 is an abundant number, since it is smaller than the sum of its proper divisors (15543062348).

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

12040400020 is a wasteful number, since it uses less digits than its factorization.

12040400020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54729111 (or 54729109 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 12040400020 its reverse (2000404021), we get a palindrome (14040804041).

The spelling of 12040400020 in words is "twelve billion, forty million, four hundred thousand, twenty".