20180045 has 4 divisors (see below), whose sum is σ = 24216060. Its totient is φ = 16144032.

The previous prime is 20180009. The next prime is 20180051. The reversal of 20180045 is 54008102.

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 3378244 + 16801801 = 1838^2 + 4099^2 .

It is a cyclic number.

It is not a de Polignac number, because 20180045 - 2⁶ = 20179981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20179999 and 20180026.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2018000 + ... + 2018009.

It is an arithmetic number, because the mean of its divisors is an integer number (6054015).

Almost surely, 2^20180045 is an apocalyptic number.

It is an amenable number.

20180045 is a deficient number, since it is larger than the sum of its proper divisors (4036015).

20180045 is an equidigital number, since it uses as much as digits as its factorization.

20180045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4036014.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 20180045 is about 4492.2204977049. The cubic root of 20180045 is about 272.2538584795.

Adding to 20180045 its reverse (54008102), we get a palindrome (74188147).

The spelling of 20180045 in words is "twenty million, one hundred eighty thousand, forty-five".