20200045 has 4 divisors (see below), whose sum is σ = 24240060. Its totient is φ = 16160032.

The previous prime is 20200043. The next prime is 20200057. The reversal of 20200045 is 54000202.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7767369 + 12432676 = 2787^2 + 3526^2 .

It is a cyclic number.

It is not a de Polignac number, because 20200045 - 2¹ = 20200043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20199998 and 20200034.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20200043) 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, 2020000 + ... + 2020009.

It is an arithmetic number, because the mean of its divisors is an integer number (6060015).

Almost surely, 2^20200045 is an apocalyptic number.

It is an amenable number.

20200045 is a deficient number, since it is larger than the sum of its proper divisors (4040015).

20200045 is an equidigital number, since it uses as much as digits as its factorization.

20200045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4040014.

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 20200045 is about 4494.4460170304. The cubic root of 20200045 is about 272.3437703921.

Adding to 20200045 its reverse (54000202), we get a palindrome (74200247).

The spelling of 20200045 in words is "twenty million, two hundred thousand, forty-five".