20841161 has 12 divisors (see below), whose sum is σ = 23472372. Its totient is φ = 18480000.

The previous prime is 20841113. The next prime is 20841179. The reversal of 20841161 is 16114802.

It can be written as a sum of positive squares in 2 ways, for example, as 1092025 + 19749136 = 1045^2 + 4444^2 .

It is not a de Polignac number, because 20841161 - 2²² = 16646857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20841181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2861 + ... + 7061.

It is an arithmetic number, because the mean of its divisors is an integer number (1956031).

Almost surely, 2^20841161 is an apocalyptic number.

It is an amenable number.

20841161 is a deficient number, since it is larger than the sum of its proper divisors (2631211).

20841161 is a wasteful number, since it uses less digits than its factorization.

20841161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4264 (or 4253 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 20841161 is about 4565.2120432681. The cubic root of 20841161 is about 275.1950616072.

Adding to 20841161 its reverse (16114802), we get a palindrome (36955963).

The spelling of 20841161 in words is "twenty million, eight hundred forty-one thousand, one hundred sixty-one".