20201161 has 4 divisors (see below), whose sum is σ = 21264400. Its totient is φ = 19137924.

The previous prime is 20201143. The next prime is 20201173. The reversal of 20201161 is 16110202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16110202 = 2 ⋅8055101.

It is a cyclic number.

It is not a de Polignac number, because 20201161 - 2¹³ = 20192969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20201101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531591 + ... + 531628.

It is an arithmetic number, because the mean of its divisors is an integer number (5316100).

Almost surely, 2^20201161 is an apocalyptic number.

It is an amenable number.

20201161 is a deficient number, since it is larger than the sum of its proper divisors (1063239).

20201161 is a wasteful number, since it uses less digits than its factorization.

20201161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063238.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 20201161 is about 4494.5701685478. The cubic root of 20201161 is about 272.3487857283.

Adding to 20201161 its reverse (16110202), we get a palindrome (36311363).

The spelling of 20201161 in words is "twenty million, two hundred one thousand, one hundred sixty-one".