20113161 has 12 divisors (see below), whose sum is σ = 27089712. Its totient is φ = 13273944.

The previous prime is 20113139. The next prime is 20113169. The reversal of 20113161 is 16131102.

It is not a de Polignac number, because 20113161 - 2⁶ = 20113097 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20113161.

It is not an unprimeable number, because it can be changed into a prime (20113169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57790 + ... + 58136.

It is an arithmetic number, because the mean of its divisors is an integer number (2257476).

Almost surely, 2^20113161 is an apocalyptic number.

It is an amenable number.

20113161 is a deficient number, since it is larger than the sum of its proper divisors (6976551).

20113161 is an equidigital number, since it uses as much as digits as its factorization.

20113161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 20113161 is about 4484.7698937627. The cubic root of 20113161 is about 271.9527428353.

Adding to 20113161 its reverse (16131102), we get a palindrome (36244263).

The spelling of 20113161 in words is "twenty million, one hundred thirteen thousand, one hundred sixty-one".