20444213665 has 16 divisors (see below), whose sum is σ = 26482464000. Its totient is φ = 15104807872.

The previous prime is 20444213663. The next prime is 20444213681. The reversal of 20444213665 is 56631244402.

It is a cyclic number.

It is not a de Polignac number, because 20444213665 - 2¹ = 20444213663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20444213663) 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, 3061765 + ... + 3068434.

It is an arithmetic number, because the mean of its divisors is an integer number (1655154000).

Almost surely, 2^20444213665 is an apocalyptic number.

It is an amenable number.

20444213665 is a deficient number, since it is larger than the sum of its proper divisors (6038250335).

20444213665 is a wasteful number, since it uses less digits than its factorization.

20444213665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6130256.

The product of its (nonzero) digits is 138240, while the sum is 37.

The spelling of 20444213665 in words is "twenty billion, four hundred forty-four million, two hundred thirteen thousand, six hundred sixty-five".