20633424818 has 4 divisors (see below), whose sum is σ = 30950137230. Its totient is φ = 10316712408.

The previous prime is 20633424817. The next prime is 20633424857. The reversal of 20633424818 is 81842433602.

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., 18926330329 + 1707094489 = 137573^2 + 41317^2 .

It is not an unprimeable number, because it can be changed into a prime (20633424811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5158356203 + ... + 5158356206.

Almost surely, 2^20633424818 is an apocalyptic number.

20633424818 is a deficient number, since it is larger than the sum of its proper divisors (10316712412).

20633424818 is a wasteful number, since it uses less digits than its factorization.

20633424818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10316712411.

The product of its (nonzero) digits is 221184, while the sum is 41.

The spelling of 20633424818 in words is "twenty billion, six hundred thirty-three million, four hundred twenty-four thousand, eight hundred eighteen".