20355205828 has 24 divisors (see below), whose sum is σ = 36213224600. Its totient is φ = 10009370880.

The previous prime is 20355205817. The next prime is 20355205841. The reversal of 20355205828 is 82850255302.

It can be written as a sum of positive squares in 4 ways, for example, as 6467054724 + 13888151104 = 80418^2 + 117848^2 .

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 7 ways as a sum of consecutive naturals, for example, 2038 + ... + 201778.

Almost surely, 2^20355205828 is an apocalyptic number.

It is an amenable number.

20355205828 is a deficient number, since it is larger than the sum of its proper divisors (15858018772).

20355205828 is a wasteful number, since it uses less digits than its factorization.

20355205828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200167 (or 200165 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 40.

The spelling of 20355205828 in words is "twenty billion, three hundred fifty-five million, two hundred five thousand, eight hundred twenty-eight".