20111512004440 has 16 divisors (see below), whose sum is σ = 45250902010080. Its totient is φ = 8044604801760.

The previous prime is 20111512004431. The next prime is 20111512004443. The reversal of 20111512004440 is 4440021511102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111512004443) 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, 251393900016 + ... + 251393900095.

It is an arithmetic number, because the mean of its divisors is an integer number (2828181375630).

Almost surely, 2^{20111512004440} is an apocalyptic number.

20111512004440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111512004440 is an abundant number, since it is smaller than the sum of its proper divisors (25139390005640).

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

20111512004440 is a wasteful number, since it uses less digits than its factorization.

20111512004440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502787800122 (or 502787800118 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

Adding to 20111512004440 its reverse (4440021511102), we get a palindrome (24551533515542).

The spelling of 20111512004440 in words is "twenty trillion, one hundred eleven billion, five hundred twelve million, four thousand, four hundred forty".