20112420040 has 128 divisors (see below), whose sum is σ = 47086997760. Its totient is φ = 7725487104.

The previous prime is 20112420023. The next prime is 20112420047. The reversal of 20112420040 is 4002421102.

It is a junction number, because it is equal to n+sod(n) for n = 20112419996 and 20112420023.

It is not an unprimeable number, because it can be changed into a prime (20112420047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63445962 + ... + 63446278.

It is an arithmetic number, because the mean of its divisors is an integer number (367867170).

Almost surely, 2^20112420040 is an apocalyptic number.

20112420040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20112420040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23543498880).

20112420040 is an abundant number, since it is smaller than the sum of its proper divisors (26974577720).

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

20112420040 is a wasteful number, since it uses less digits than its factorization.

20112420040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791 (or 787 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20112420040 its reverse (4002421102), we get a palindrome (24114841142).

The spelling of 20112420040 in words is "twenty billion, one hundred twelve million, four hundred twenty thousand, forty".