20018182 has 4 divisors (see below), whose sum is σ = 30027276. Its totient is φ = 10009090.

The previous prime is 20018171. The next prime is 20018227. The reversal of 20018182 is 28181002.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×20018182² = 801455221170248, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5004544 + ... + 5004547.

It is an arithmetic number, because the mean of its divisors is an integer number (7506819).

Almost surely, 2^20018182 is an apocalyptic number.

20018182 is a deficient number, since it is larger than the sum of its proper divisors (10009094).

20018182 is a wasteful number, since it uses less digits than its factorization.

20018182 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10009093.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 20018182 is about 4474.1683026011. The cubic root of 20018182 is about 271.5239926476.

Adding to 20018182 its reverse (28181002), we get a palindrome (48199184).

Subtracting 20018182 from its reverse (28181002), we obtain a triangular number (8162820 = T₄₀₄₀).

The spelling of 20018182 in words is "twenty million, eighteen thousand, one hundred eighty-two".