18020028 has 24 divisors (see below), whose sum is σ = 45281488. Its totient is φ = 5544576.

The previous prime is 18020027. The next prime is 18020039. The reversal of 18020028 is 82002081.

It is a junction number, because it is equal to n+sod(n) for n = 18019986 and 18020013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18020027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57601 + ... + 57912.

Almost surely, 2^18020028 is an apocalyptic number.

It is an amenable number.

18020028 is an abundant number, since it is smaller than the sum of its proper divisors (27261460).

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

18020028 is a wasteful number, since it uses less digits than its factorization.

18020028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115533 (or 115531 counting only the distinct ones).

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

The square root of 18020028 is about 4245.0003533569. Note that the first 3 decimals coincide. The cubic root of 18020028 is about 262.1713037790.

The spelling of 18020028 in words is "eighteen million, twenty thousand, twenty-eight".