20200181 has 2 divisors, whose sum is σ = 20200182. Its totient is φ = 20200180.

The previous prime is 20200171. The next prime is 20200223. The reversal of 20200181 is 18100202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19945156 + 255025 = 4466^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 20200181 - 2²² = 16005877 is a prime.

It is a super-2 number, since 2×20200181² = 816094624865522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20200111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100090 + 10100091.

It is an arithmetic number, because the mean of its divisors is an integer number (10100091).

Almost surely, 2^20200181 is an apocalyptic number.

It is an amenable number.

20200181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200181 is an equidigital number, since it uses as much as digits as its factorization.

20200181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 20200181 is about 4494.4611467895. The cubic root of 20200181 is about 272.3443815899.

Adding to 20200181 its reverse (18100202), we get a palindrome (38300383).

The spelling of 20200181 in words is "twenty million, two hundred thousand, one hundred eighty-one".