20202111173 has 2 divisors, whose sum is σ = 20202111174. Its totient is φ = 20202111172.

The previous prime is 20202111169. The next prime is 20202111199. The reversal of 20202111173 is 37111120202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11776156324 + 8425954849 = 108518^2 + 91793^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202111173 - 2² = 20202111169 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20202119173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101055586 + 10101055587.

It is an arithmetic number, because the mean of its divisors is an integer number (10101055587).

Almost surely, 2^20202111173 is an apocalyptic number.

It is an amenable number.

20202111173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202111173 is an equidigital number, since it uses as much as digits as its factorization.

20202111173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 20202111173 its reverse (37111120202), we get a palindrome (57313231375).

The spelling of 20202111173 in words is "twenty billion, two hundred two million, one hundred eleven thousand, one hundred seventy-three".