18020113 has 4 divisors (see below), whose sum is σ = 18968560. Its totient is φ = 17071668.

The previous prime is 18020111. The next prime is 18020143. The reversal of 18020113 is 31102081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31102081 = 4231 ⋅7351.

It is a cyclic number.

It is not a de Polignac number, because 18020113 - 2¹ = 18020111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18020111) 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, 474195 + ... + 474232.

It is an arithmetic number, because the mean of its divisors is an integer number (4742140).

Almost surely, 2^18020113 is an apocalyptic number.

It is an amenable number.

18020113 is a deficient number, since it is larger than the sum of its proper divisors (948447).

18020113 is an equidigital number, since it uses as much as digits as its factorization.

18020113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948446.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 18020113 is about 4245.0103651228. The cubic root of 18020113 is about 262.1717159967.

Adding to 18020113 its reverse (31102081), we get a palindrome (49122194).

The spelling of 18020113 in words is "eighteen million, twenty thousand, one hundred thirteen".