20045323 has 4 divisors (see below), whose sum is σ = 21100360. Its totient is φ = 18990288.

The previous prime is 20045321. The next prime is 20045327. The reversal of 20045323 is 32354002.

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

It is a cyclic number.

It is not a de Polignac number, because 20045323 - 2¹ = 20045321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1055017 = 20045323 / (2 + 0 + 0 + 4 + 5 + 3 + 2 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20045323.

It is not an unprimeable number, because it can be changed into a prime (20045321) 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, 527490 + ... + 527527.

It is an arithmetic number, because the mean of its divisors is an integer number (5275090).

Almost surely, 2^20045323 is an apocalyptic number.

20045323 is a deficient number, since it is larger than the sum of its proper divisors (1055037).

20045323 is a wasteful number, since it uses less digits than its factorization.

20045323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055036.

The product of its (nonzero) digits is 720, while the sum is 19.

The square root of 20045323 is about 4477.2003528991. The cubic root of 20045323 is about 271.6466495512.

Adding to 20045323 its reverse (32354002), we get a palindrome (52399325).

The spelling of 20045323 in words is "twenty million, forty-five thousand, three hundred twenty-three".