20045123 has 4 divisors (see below), whose sum is σ = 22908720. Its totient is φ = 17181528.

The previous prime is 20045117. The next prime is 20045131. The reversal of 20045123 is 32154002.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20045123 - 2¹⁴ = 20028739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20047123) 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 3 ways as a sum of consecutive naturals, for example, 1431788 + ... + 1431801.

It is an arithmetic number, because the mean of its divisors is an integer number (5727180).

Almost surely, 2^20045123 is an apocalyptic number.

20045123 is a deficient number, since it is larger than the sum of its proper divisors (2863597).

20045123 is an equidigital number, since it uses as much as digits as its factorization.

20045123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2863596.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20045123 is about 4477.1780174570. The cubic root of 20045123 is about 271.6457461067.

Adding to 20045123 its reverse (32154002), we get a palindrome (52199125).

The spelling of 20045123 in words is "twenty million, forty-five thousand, one hundred twenty-three".