20487782775 has 24 divisors (see below), whose sum is σ = 33981394000. Its totient is φ = 10891895040.

The previous prime is 20487782771. The next prime is 20487782803. The reversal of 20487782775 is 57728778402.

It is not a de Polignac number, because 20487782775 - 2² = 20487782771 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20487782771) 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 23 ways as a sum of consecutive naturals, for example, 412900 + ... + 459849.

Almost surely, 2^20487782775 is an apocalyptic number.

20487782775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20487782775 is a deficient number, since it is larger than the sum of its proper divisors (13493611225).

20487782775 is a wasteful number, since it uses less digits than its factorization.

20487782775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873075 (or 873070 counting only the distinct ones).

The product of its (nonzero) digits is 12293120, while the sum is 57.

The spelling of 20487782775 in words is "twenty billion, four hundred eighty-seven million, seven hundred eighty-two thousand, seven hundred seventy-five".