20225161 has 16 divisors (see below), whose sum is σ = 22697280. Its totient is φ = 17867520.

The previous prime is 20225159. The next prime is 20225167. The reversal of 20225161 is 16152202.

It is not a de Polignac number, because 20225161 - 2¹ = 20225159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20225167) 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, 71326 + ... + 71608.

It is an arithmetic number, because the mean of its divisors is an integer number (1418580).

Almost surely, 2^20225161 is an apocalyptic number.

It is an amenable number.

20225161 is a deficient number, since it is larger than the sum of its proper divisors (2472119).

20225161 is a wasteful number, since it uses less digits than its factorization.

20225161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20225161 is about 4497.2392642598. The cubic root of 20225161 is about 272.4565977504.

Adding to 20225161 its reverse (16152202), we get a palindrome (36377363).

The spelling of 20225161 in words is "twenty million, two hundred twenty-five thousand, one hundred sixty-one".