20510758866 has 32 divisors (see below), whose sum is σ = 44405948160. Its totient is φ = 6278298624.

The previous prime is 20510758789. The next prime is 20510758867. The reversal of 20510758866 is 66885701502.

20510758866 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (20510758867) 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 15 ways as a sum of consecutive naturals, for example, 666186 + ... + 696293.

It is an arithmetic number, because the mean of its divisors is an integer number (1387685880).

Almost surely, 2^20510758866 is an apocalyptic number.

20510758866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20510758866 is an abundant number, since it is smaller than the sum of its proper divisors (23895189294).

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

20510758866 is a wasteful number, since it uses less digits than its factorization.

20510758866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362690.

The product of its (nonzero) digits is 806400, while the sum is 48.

It can be divided in two parts, 20510 and 758866, that added together give a triangular number (779376 = T₁₂₄₈).

The spelling of 20510758866 in words is "twenty billion, five hundred ten million, seven hundred fifty-eight thousand, eight hundred sixty-six".