20620145 has 16 divisors (see below), whose sum is σ = 30455040. Its totient is φ = 13051584.

The previous prime is 20620129. The next prime is 20620151. The reversal of 20620145 is 54102602.

It is a happy number.

It is not a de Polignac number, because 20620145 - 2⁴ = 20620129 is a prime.

It is an unprimeable number.

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, 22205 + ... + 23114.

It is an arithmetic number, because the mean of its divisors is an integer number (1903440).

Almost surely, 2^20620145 is an apocalyptic number.

It is an amenable number.

20620145 is a deficient number, since it is larger than the sum of its proper divisors (9834895).

20620145 is a wasteful number, since it uses less digits than its factorization.

20620145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45344.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20620145 is about 4540.9409817790. The cubic root of 20620145 is about 274.2188077626.

Adding to 20620145 its reverse (54102602), we get a palindrome (74722747).

The spelling of 20620145 in words is "twenty million, six hundred twenty thousand, one hundred forty-five".