20018028 has 24 divisors (see below), whose sum is σ = 46807488. Its totient is φ = 6658576.

The previous prime is 20018021. The next prime is 20018069. The reversal of 20018028 is 82081002.

It is a junction number, because it is equal to n+sod(n) for n = 20017995 and 20018013.

It is not an unprimeable number, because it can be changed into a prime (20018021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5275 + ... + 8237.

It is an arithmetic number, because the mean of its divisors is an integer number (1950312).

Almost surely, 2^20018028 is an apocalyptic number.

It is an amenable number.

20018028 is an abundant number, since it is smaller than the sum of its proper divisors (26789460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20018028 is a wasteful number, since it uses less digits than its factorization.

20018028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3533 (or 3531 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 20018028 is about 4474.1510926655. The cubic root of 20018028 is about 271.5232963673.

The spelling of 20018028 in words is "twenty million, eighteen thousand, twenty-eight".