20011033223440 has 80 divisors (see below), whose sum is σ = 53209437628032. Its totient is φ = 6856117466112.

The previous prime is 20011033223393. The next prime is 20011033223449. The reversal of 20011033223440 is 4432233011002.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (20011033223449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11721549 + ... + 13319788.

Almost surely, 2^{20011033223440} is an apocalyptic number.

20011033223440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011033223440 is an abundant number, since it is smaller than the sum of its proper divisors (33198404404592).

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

20011033223440 is a wasteful number, since it uses less digits than its factorization.

20011033223440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25042784 (or 25042778 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 20011033223440 its reverse (4432233011002), we get a palindrome (24443266234442).

The spelling of 20011033223440 in words is "twenty trillion, eleven billion, thirty-three million, two hundred twenty-three thousand, four hundred forty".