20858736828 has 72 divisors (see below), whose sum is σ = 50516547312. Its totient is φ = 6693912576.

The previous prime is 20858736803. The next prime is 20858736841. The reversal of 20858736828 is 82863785802.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4175100 + ... + 4180092.

Almost surely, 2^20858736828 is an apocalyptic number.

It is an amenable number.

20858736828 is an abundant number, since it is smaller than the sum of its proper divisors (29657810484).

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

20858736828 is a wasteful number, since it uses less digits than its factorization.

20858736828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5231 (or 5132 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 57.

The spelling of 20858736828 in words is "twenty billion, eight hundred fifty-eight million, seven hundred thirty-six thousand, eight hundred twenty-eight".