20235784018 has 4 divisors (see below), whose sum is σ = 30353676030. Its totient is φ = 10117892008.

The previous prime is 20235784013. The next prime is 20235784027. The reversal of 20235784018 is 81048753202.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 17075432929 + 3160351089 = 130673^2 + 56217^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20235784013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5058946003 + ... + 5058946006.

Almost surely, 2^20235784018 is an apocalyptic number.

20235784018 is a deficient number, since it is larger than the sum of its proper divisors (10117892012).

20235784018 is a wasteful number, since it uses less digits than its factorization.

20235784018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10117892011.

The product of its (nonzero) digits is 107520, while the sum is 40.

The spelling of 20235784018 in words is "twenty billion, two hundred thirty-five million, seven hundred eighty-four thousand, eighteen".