20018013 has 4 divisors (see below), whose sum is σ = 26690688. Its totient is φ = 13345340.

The previous prime is 20017997. The next prime is 20018017. The reversal of 20018013 is 31081002.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 20018013 - 2⁴ = 20017997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20017983 and 20018001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20018017) 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, 3336333 + ... + 3336338.

It is an arithmetic number, because the mean of its divisors is an integer number (6672672).

Almost surely, 2^20018013 is an apocalyptic number.

It is an amenable number.

20018013 is a deficient number, since it is larger than the sum of its proper divisors (6672675).

20018013 is an equidigital number, since it uses as much as digits as its factorization.

20018013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6672674.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 20018013 is about 4474.1494163696. The cubic root of 20018013 is about 271.5232285475.

Adding to 20018013 its reverse (31081002), we get a palindrome (51099015).

The spelling of 20018013 in words is "twenty million, eighteen thousand, thirteen".