20032161 has 16 divisors (see below), whose sum is σ = 27181440. Its totient is φ = 13121280.

The previous prime is 20032141. The next prime is 20032163. The reversal of 20032161 is 16123002.

It is not a de Polignac number, because 20032161 - 2⁶ = 20032097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20032161.

It is not an unprimeable number, because it can be changed into a prime (20032163) 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 15 ways as a sum of consecutive naturals, for example, 74335 + ... + 74603.

It is an arithmetic number, because the mean of its divisors is an integer number (1698840).

Almost surely, 2^20032161 is an apocalyptic number.

It is an amenable number.

20032161 is a deficient number, since it is larger than the sum of its proper divisors (7149279).

20032161 is a wasteful number, since it uses less digits than its factorization.

20032161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 20032161 is about 4475.7302197519. The cubic root of 20032161 is about 271.5871810484.

Adding to 20032161 its reverse (16123002), we get a palindrome (36155163).

The spelling of 20032161 in words is "twenty million, thirty-two thousand, one hundred sixty-one".