20260161 has 6 divisors (see below), whose sum is σ = 29264690. Its totient is φ = 13506768.

The previous prime is 20260159. The next prime is 20260169. The reversal of 20260161 is 16106202.

It is a happy number.

20260161 is a `hidden beast` number, since 2 + 0 + 2 + 601 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13727025 + 6533136 = 3705^2 + 2556^2 .

It is not a de Polignac number, because 20260161 - 2¹ = 20260159 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20260169) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1125556 + ... + 1125573.

Almost surely, 2^20260161 is an apocalyptic number.

It is an amenable number.

20260161 is a deficient number, since it is larger than the sum of its proper divisors (9004529).

20260161 is a wasteful number, since it uses less digits than its factorization.

20260161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251135 (or 2251132 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20260161 is about 4501.1288584087. The cubic root of 20260161 is about 272.6136708383.

Adding to 20260161 its reverse (16106202), we get a palindrome (36366363).

The spelling of 20260161 in words is "twenty million, two hundred sixty thousand, one hundred sixty-one".