180020605 has 4 divisors (see below), whose sum is σ = 216024732. Its totient is φ = 144016480.

The previous prime is 180020597. The next prime is 180020629. The reversal of 180020605 is 506020081.

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 97337956 + 82682649 = 9866^2 + 9093^2 .

It is not a de Polignac number, because 180020605 - 2³ = 180020597 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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, 18002056 + ... + 18002065.

It is an arithmetic number, because the mean of its divisors is an integer number (54006183).

Almost surely, 2^180020605 is an apocalyptic number.

It is an amenable number.

180020605 is a deficient number, since it is larger than the sum of its proper divisors (36004127).

180020605 is an equidigital number, since it uses as much as digits as its factorization.

180020605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36004126.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 180020605 is about 13417.1757460354. The cubic root of 180020605 is about 564.6431610037.

Adding to 180020605 its reverse (506020081), we get a palindrome (686040686).

It can be divided in two parts, 180020 and 605, that added together give a square (180625 = 425²).

The spelling of 180020605 in words is "one hundred eighty million, twenty thousand, six hundred five".