20747865871828 has 12 divisors (see below), whose sum is σ = 36308804847700. Its totient is φ = 10373921629632.

The previous prime is 20747865871813. The next prime is 20747865871853. The reversal of 20747865871828 is 82817856874702.

It can be written as a sum of positive squares in 2 ways, for example, as 17776696602564 + 2971169269264 = 4216242^2 + 1723708^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2359648 + ... + 6860296.

Almost surely, 2^{20747865871828} is an apocalyptic number.

It is an amenable number.

20747865871828 is a deficient number, since it is larger than the sum of its proper divisors (15560938975872).

20747865871828 is a wasteful number, since it uses less digits than its factorization.

20747865871828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5653146 (or 5653144 counting only the distinct ones).

The product of its (nonzero) digits is 674365440, while the sum is 73.

The spelling of 20747865871828 in words is "twenty trillion, seven hundred forty-seven billion, eight hundred sixty-five million, eight hundred seventy-one thousand, eight hundred twenty-eight".