20444424644621 has 16 divisors (see below), whose sum is σ = 21363680987136. Its totient is φ = 19527717985776.

The previous prime is 20444424644599. The next prime is 20444424644641. The reversal of 20444424644621 is 12644642444402.

It is a cyclic number.

It is not a de Polignac number, because 20444424644621 - 2⁶ = 20444424644557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20444424644641) 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, 47479136 + ... + 47907798.

It is an arithmetic number, because the mean of its divisors is an integer number (1335230061696).

Almost surely, 2^{20444424644621} is an apocalyptic number.

It is an amenable number.

20444424644621 is a deficient number, since it is larger than the sum of its proper divisors (919256342515).

20444424644621 is a wasteful number, since it uses less digits than its factorization.

20444424644621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431632.

The product of its (nonzero) digits is 4718592, while the sum is 47.

The spelling of 20444424644621 in words is "twenty trillion, four hundred forty-four billion, four hundred twenty-four million, six hundred forty-four thousand, six hundred twenty-one".