20521544412 has 48 divisors (see below), whose sum is σ = 48195090720. Its totient is φ = 6796075008.

The previous prime is 20521544401. The next prime is 20521544413. The reversal of 20521544412 is 21444512502.

It is a super-5 number, since 5×20521544412⁵ (a number of 53 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 20521544412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20521544413) 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, 3918948 + ... + 3924180.

It is an arithmetic number, because the mean of its divisors is an integer number (1004064390).

Almost surely, 2^20521544412 is an apocalyptic number.

It is an amenable number.

20521544412 is an abundant number, since it is smaller than the sum of its proper divisors (27673546308).

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

20521544412 is a wasteful number, since it uses less digits than its factorization.

20521544412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7302 (or 7300 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

The spelling of 20521544412 in words is "twenty billion, five hundred twenty-one million, five hundred forty-four thousand, four hundred twelve".