20233181 has 2 divisors, whose sum is σ = 20233182. Its totient is φ = 20233180.

The previous prime is 20233163. The next prime is 20233183. The reversal of 20233181 is 18133202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16736281 + 3496900 = 4091^2 + 1870^2 .

It is a cyclic number.

It is not a de Polignac number, because 20233181 - 2²² = 16038877 is a prime.

It is a super-2 number, since 2×20233181² = 818763226757522, which contains 22 as substring.

Together with 20233183, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20233183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10116590 + 10116591.

It is an arithmetic number, because the mean of its divisors is an integer number (10116591).

Almost surely, 2^20233181 is an apocalyptic number.

It is an amenable number.

20233181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20233181 is an equidigital number, since it uses as much as digits as its factorization.

20233181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20233181 is about 4498.1308340243. The cubic root of 20233181 is about 272.4926059212.

Adding to 20233181 its reverse (18133202), we get a palindrome (38366383).

The spelling of 20233181 in words is "twenty million, two hundred thirty-three thousand, one hundred eighty-one".