20218000 has 80 divisors (see below), whose sum is σ = 53389440. Its totient is φ = 7344000.

The previous prime is 20217949. The next prime is 20218013. The reversal of 20218000 is 81202.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21541 + ... + 22459.

It is an arithmetic number, because the mean of its divisors is an integer number (667368).

Almost surely, 2^20218000 is an apocalyptic number.

20218000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20218000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26694720).

20218000 is an abundant number, since it is smaller than the sum of its proper divisors (33171440).

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

20218000 is a wasteful number, since it uses less digits than its factorization.

20218000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953 (or 937 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 20218000 is about 4496.4430386696. The cubic root of 20218000 is about 272.4244382700.

Adding to 20218000 its reverse (81202), we get a palindrome (20299202).

The spelling of 20218000 in words is "twenty million, two hundred eighteen thousand".