20225145 has 16 divisors (see below), whose sum is σ = 32417280. Its totient is φ = 10767744.

The previous prime is 20225143. The next prime is 20225147. The reversal of 20225145 is 54152202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20225143) and next prime (20225147).

It is not a de Polignac number, because 20225145 - 2¹ = 20225143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20225143) 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 15 ways as a sum of consecutive naturals, for example, 13336 + ... + 14774.

It is an arithmetic number, because the mean of its divisors is an integer number (2026080).

Almost surely, 2^20225145 is an apocalyptic number.

It is an amenable number.

20225145 is a deficient number, since it is larger than the sum of its proper divisors (12192135).

20225145 is a wasteful number, since it uses less digits than its factorization.

20225145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 20225145 is about 4497.2374853903. The cubic root of 20225145 is about 272.4565259041.

Adding to 20225145 its reverse (54152202), we get a palindrome (74377347).

The spelling of 20225145 in words is "twenty million, two hundred twenty-five thousand, one hundred forty-five".