20502791875 has 10 divisors (see below), whose sum is σ = 25620289508. Its totient is φ = 16402233000.

The previous prime is 20502791857. The next prime is 20502791891. The reversal of 20502791875 is 57819720502.

It is a happy number.

It is not a de Polignac number, because 20502791875 - 2⁷ = 20502791747 is a prime.

It is a Duffinian 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 9 ways as a sum of consecutive naturals, for example, 16401609 + ... + 16402858.

Almost surely, 2^20502791875 is an apocalyptic number.

20502791875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20502791875 is a deficient number, since it is larger than the sum of its proper divisors (5117497633).

20502791875 is an frugal number, since it uses more digits than its factorization.

20502791875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32804487 (or 32804472 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 46.

The spelling of 20502791875 in words is "twenty billion, five hundred two million, seven hundred ninety-one thousand, eight hundred seventy-five".