20633664773 has 4 divisors (see below), whose sum is σ = 20635086060. Its totient is φ = 20632243488.

The previous prime is 20633664731. The next prime is 20633664781. The reversal of 20633664773 is 37746633602.

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 17832397444 + 2801267329 = 133538^2 + 52927^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20633664773 is a prime.

It is a super-2 number, since 2×20633664773² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20633664703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 688640 + ... + 717977.

It is an arithmetic number, because the mean of its divisors is an integer number (5158771515).

Almost surely, 2^20633664773 is an apocalyptic number.

It is an amenable number.

20633664773 is a deficient number, since it is larger than the sum of its proper divisors (1421287).

20633664773 is a wasteful number, since it uses less digits than its factorization.

20633664773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421286.

The product of its (nonzero) digits is 2286144, while the sum is 47.

The spelling of 20633664773 in words is "twenty billion, six hundred thirty-three million, six hundred sixty-four thousand, seven hundred seventy-three".