20018250 has 192 divisors, whose sum is σ = 65415168. Its totient is φ = 4320000.

The previous prime is 20018239. The next prime is 20018269. The reversal of 20018250 is 5281002.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 488230 + ... + 488270.

It is an arithmetic number, because the mean of its divisors is an integer number (340704).

Almost surely, 2^20018250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20018250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32707584).

20018250 is an abundant number, since it is smaller than the sum of its proper divisors (45396918).

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

20018250 is a wasteful number, since it uses less digits than its factorization.

20018250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 20018250 is about 4474.1759017723. The cubic root of 20018250 is about 271.5243000950.

Adding to 20018250 its reverse (5281002), we get a palindrome (25299252).

The spelling of 20018250 in words is "twenty million, eighteen thousand, two hundred fifty".