20011161 has 16 divisors (see below), whose sum is σ = 28180800. Its totient is φ = 12595968.

The previous prime is 20011153. The next prime is 20011163. The reversal of 20011161 is 16111002.

It is a happy number.

It is not a de Polignac number, because 20011161 - 2³ = 20011153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20011163) 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, 32125 + ... + 32741.

It is an arithmetic number, because the mean of its divisors is an integer number (1761300).

Almost surely, 2^20011161 is an apocalyptic number.

It is an amenable number.

20011161 is a deficient number, since it is larger than the sum of its proper divisors (8169639).

20011161 is a wasteful number, since it uses less digits than its factorization.

20011161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 20011161 is about 4473.3836186940. The cubic root of 20011161 is about 271.4922449616.

Adding to 20011161 its reverse (16111002), we get a palindrome (36122163).

The spelling of 20011161 in words is "twenty million, eleven thousand, one hundred sixty-one".