20033644993 has 4 divisors (see below), whose sum is σ = 20036196180. Its totient is φ = 20031093808.

The previous prime is 20033644991. The next prime is 20033644999. The reversal of 20033644993 is 39944633002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1190043009 + 18843601984 = 34497^2 + 137272^2 .

It is a cyclic number.

It is not a de Polignac number, because 20033644993 - 2¹ = 20033644991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20033644991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1263778 + ... + 1279531.

It is an arithmetic number, because the mean of its divisors is an integer number (5009049045).

Almost surely, 2^20033644993 is an apocalyptic number.

It is an amenable number.

20033644993 is a deficient number, since it is larger than the sum of its proper divisors (2551187).

20033644993 is an equidigital number, since it uses as much as digits as its factorization.

20033644993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551186.

The product of its (nonzero) digits is 419904, while the sum is 43.

The spelling of 20033644993 in words is "twenty billion, thirty-three million, six hundred forty-four thousand, nine hundred ninety-three".