20510530356 has 12 divisors (see below), whose sum is σ = 47857904192. Its totient is φ = 6836843448.

The previous prime is 20510530321. The next prime is 20510530357. The reversal of 20510530356 is 65303501502.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20510530357) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 854605420 + ... + 854605443.

Almost surely, 2^20510530356 is an apocalyptic number.

It is an amenable number.

20510530356 is an abundant number, since it is smaller than the sum of its proper divisors (27347373836).

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

20510530356 is a wasteful number, since it uses less digits than its factorization.

20510530356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709210870 (or 1709210868 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 30.

The spelling of 20510530356 in words is "twenty billion, five hundred ten million, five hundred thirty thousand, three hundred fifty-six".