20843635128 has 32 divisors (see below), whose sum is σ = 55174329360. Its totient is φ = 6539179520.

The previous prime is 20843635123. The next prime is 20843635129. The reversal of 20843635128 is 82153634802.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20843635128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20843635123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25543263 + ... + 25544078.

Almost surely, 2^20843635128 is an apocalyptic number.

It is an amenable number.

20843635128 is an abundant number, since it is smaller than the sum of its proper divisors (34330694232).

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

20843635128 is a wasteful number, since it uses less digits than its factorization.

20843635128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51087367 (or 51087363 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 20843635128 in words is "twenty billion, eight hundred forty-three million, six hundred thirty-five thousand, one hundred twenty-eight".