20444353203161 has 4 divisors (see below), whose sum is σ = 20444615896500. Its totient is φ = 20444090509824.

The previous prime is 20444353203143. The next prime is 20444353203163. The reversal of 20444353203161 is 16130235344402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6830695873600 + 13613657329561 = 2613560^2 + 3689669^2 .

It is a cyclic number.

It is not a de Polignac number, because 20444353203161 - 2³⁴ = 20427173333977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20444353203163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131229896 + ... + 131385593.

It is an arithmetic number, because the mean of its divisors is an integer number (5111153974125).

Almost surely, 2^{20444353203161} is an apocalyptic number.

It is an amenable number.

20444353203161 is a deficient number, since it is larger than the sum of its proper divisors (262693339).

20444353203161 is an equidigital number, since it uses as much as digits as its factorization.

20444353203161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262693338.

The product of its (nonzero) digits is 207360, while the sum is 38.

Adding to 20444353203161 its reverse (16130235344402), we get a palindrome (36574588547563).

The spelling of 20444353203161 in words is "twenty trillion, four hundred forty-four billion, three hundred fifty-three million, two hundred three thousand, one hundred sixty-one".