18020220002 has 8 divisors (see below), whose sum is σ = 27053221212. Its totient is φ = 9002479600.

The previous prime is 18020219981. The next prime is 18020220007. The reversal of 18020220002 is 20002202081.

It can be written as a sum of positive squares in 2 ways, for example, as 13890743881 + 4129476121 = 117859^2 + 64261^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18020220007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3812249 + ... + 3816972.

Almost surely, 2^18020220002 is an apocalyptic number.

18020220002 is a deficient number, since it is larger than the sum of its proper divisors (9033001210).

18020220002 is a wasteful number, since it uses less digits than its factorization.

18020220002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7630404.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 18020220002 its reverse (20002202081), we get a palindrome (38022422083).

The spelling of 18020220002 in words is "eighteen billion, twenty million, two hundred twenty thousand, two".