20286018 has 16 divisors (see below), whose sum is σ = 45080160. Its totient is φ = 6761988.

The previous prime is 20286017. The next prime is 20286031. The reversal of 20286018 is 81068202.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20285982 and 20286000.

It is not an unprimeable number, because it can be changed into a prime (20286017) 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, 187780 + ... + 187887.

It is an arithmetic number, because the mean of its divisors is an integer number (2817510).

Almost surely, 2^20286018 is an apocalyptic number.

20286018 is an abundant number, since it is smaller than the sum of its proper divisors (24794142).

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

20286018 is a wasteful number, since it uses less digits than its factorization.

20286018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375678 (or 375672 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 20286018 is about 4504.0002220249. Note that the first 3 decimals coincide. The cubic root of 20286018 is about 272.7295957984.

The spelling of 20286018 in words is "twenty million, two hundred eighty-six thousand, eighteen".