20018673 has 12 divisors (see below), whose sum is σ = 30617028. Its totient is φ = 12560640.

The previous prime is 20018659. The next prime is 20018743. The reversal of 20018673 is 37681002.

It can be written as a sum of positive squares in 2 ways, for example, as 7144929 + 12873744 = 2673^2 + 3588^2 .

It is not a de Polignac number, because 20018673 - 2⁹ = 20018161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20018773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65268 + ... + 65573.

It is an arithmetic number, because the mean of its divisors is an integer number (2551419).

Almost surely, 2^20018673 is an apocalyptic number.

It is an amenable number.

20018673 is a deficient number, since it is larger than the sum of its proper divisors (10598355).

20018673 is a wasteful number, since it uses less digits than its factorization.

20018673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130864 (or 130861 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20018673 is about 4474.2231727977. The cubic root of 20018673 is about 271.5262125827.

Adding to 20018673 its reverse (37681002), we get a palindrome (57699675).

The spelling of 20018673 in words is "twenty million, eighteen thousand, six hundred seventy-three".