18202013 has 4 divisors (see below), whose sum is σ = 18406620. Its totient is φ = 17997408.

The previous prime is 18202003. The next prime is 18202033. The reversal of 18202013 is 31020281.

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 11035684 + 7166329 = 3322^2 + 2677^2 .

It is a cyclic number.

It is not a de Polignac number, because 18202013 - 2¹² = 18197917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18201982 and 18202000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18202003) 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, 102170 + ... + 102347.

It is an arithmetic number, because the mean of its divisors is an integer number (4601655).

Almost surely, 2^18202013 is an apocalyptic number.

It is an amenable number.

18202013 is a deficient number, since it is larger than the sum of its proper divisors (204607).

18202013 is an equidigital number, since it uses as much as digits as its factorization.

18202013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204606.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 18202013 is about 4266.3817222560. The cubic root of 18202013 is about 263.0509089091.

Adding to 18202013 its reverse (31020281), we get a palindrome (49222294).

The spelling of 18202013 in words is "eighteen million, two hundred two thousand, thirteen".