20344533206621 has 16 divisors (see below), whose sum is σ = 22862400954624. Its totient is φ = 17962817182464.

The previous prime is 20344533206579. The next prime is 20344533206629. The reversal of 20344533206621 is 12660233544302.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20344533206621 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 (20344533206629) 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, 23110280 + ... + 23974446.

It is an arithmetic number, because the mean of its divisors is an integer number (1428900059664).

Almost surely, 2^{20344533206621} is an apocalyptic number.

It is an amenable number.

20344533206621 is a deficient number, since it is larger than the sum of its proper divisors (2517867748003).

20344533206621 is a wasteful number, since it uses less digits than its factorization.

20344533206621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942940.

The product of its (nonzero) digits is 622080, while the sum is 41.

The spelling of 20344533206621 in words is "twenty trillion, three hundred forty-four billion, five hundred thirty-three million, two hundred six thousand, six hundred twenty-one".