20112120040 has 16 divisors (see below), whose sum is σ = 45252270180. Its totient is φ = 8044848000.

The previous prime is 20112120013. The next prime is 20112120071. The reversal of 20112120040 is 4002121102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19310437444 + 801682596 = 138962^2 + 28314^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20112120040.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 251401461 + ... + 251401540.

Almost surely, 2^20112120040 is an apocalyptic number.

20112120040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20112120040 is an abundant number, since it is smaller than the sum of its proper divisors (25140150140).

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

20112120040 is a wasteful number, since it uses less digits than its factorization.

20112120040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502803012 (or 502803008 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20112120040 its reverse (4002121102), we get a palindrome (24114241142).

The spelling of 20112120040 in words is "twenty billion, one hundred twelve million, one hundred twenty thousand, forty".