20450221120644 has 96 divisors (see below), whose sum is σ = 55171865575680. Its totient is φ = 5774941827072.

The previous prime is 20450221120643. The next prime is 20450221120699. The reversal of 20450221120644 is 44602112205402.

It is not an unprimeable number, because it can be changed into a prime (20450221120643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1244677 + ... + 6515340.

It is an arithmetic number, because the mean of its divisors is an integer number (574706933080).

Almost surely, 2^{20450221120644} is an apocalyptic number.

It is an amenable number.

20450221120644 is an abundant number, since it is smaller than the sum of its proper divisors (34721644455036).

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

20450221120644 is a wasteful number, since it uses less digits than its factorization.

20450221120644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7760397 (or 7760395 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 33.

The spelling of 20450221120644 in words is "twenty trillion, four hundred fifty billion, two hundred twenty-one million, one hundred twenty thousand, six hundred forty-four".