20045156 has 12 divisors (see below), whose sum is σ = 35160300. Its totient is φ = 9999360.

The previous prime is 20045131. The next prime is 20045161. The reversal of 20045156 is 65154002.

It can be written as a sum of positive squares in 2 ways, for example, as 4990756 + 15054400 = 2234^2 + 3880^2 .

It is a zygodrome in base 7.

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 3 ways as a sum of consecutive naturals, for example, 3785 + ... + 7376.

It is an arithmetic number, because the mean of its divisors is an integer number (2930025).

Almost surely, 2^20045156 is an apocalyptic number.

It is an amenable number.

20045156 is a deficient number, since it is larger than the sum of its proper divisors (15115144).

20045156 is a wasteful number, since it uses less digits than its factorization.

20045156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11614 (or 11612 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 20045156 is about 4477.1817028126. The cubic root of 20045156 is about 271.6458951754.

Adding to 20045156 its reverse (65154002), we get a palindrome (85199158).

The spelling of 20045156 in words is "twenty million, forty-five thousand, one hundred fifty-six".