20420344412012 has 12 divisors (see below), whose sum is σ = 35735635785696. Its totient is φ = 10210162758960.

The previous prime is 20420344412011. The next prime is 20420344412063. The reversal of 20420344412012 is 21021444302402.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20420344412011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5171837 + ... + 8221227.

It is an arithmetic number, because the mean of its divisors is an integer number (2977969648808).

Almost surely, 2^{20420344412012} is an apocalyptic number.

It is an amenable number.

20420344412012 is a deficient number, since it is larger than the sum of its proper divisors (15315291373684).

20420344412012 is a wasteful number, since it uses less digits than its factorization.

20420344412012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4723528 (or 4723526 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 20420344412012 its reverse (21021444302402), we get a palindrome (41441788714414).

The spelling of 20420344412012 in words is "twenty trillion, four hundred twenty billion, three hundred forty-four million, four hundred twelve thousand, twelve".