20643816050 has 144 divisors (see below), whose sum is σ = 46923830016. Its totient is φ = 6705072000.

The previous prime is 20643816047. The next prime is 20643816071. The reversal of 20643816050 is 5061834602.

It is a super-2 number, since 2×20643816050² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20643816050.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 2433917 + ... + 2442383.

Almost surely, 2^20643816050 is an apocalyptic number.

20643816050 is an abundant number, since it is smaller than the sum of its proper divisors (26280013966).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20643816050 is a wasteful number, since it uses less digits than its factorization.

20643816050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8545 (or 8529 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 20643816050 in words is "twenty billion, six hundred forty-three million, eight hundred sixteen thousand, fifty".