20787756488764 has 12 divisors (see below), whose sum is σ = 36493332765624. Its totient is φ = 10361089984304.

The previous prime is 20787756488731. The next prime is 20787756488869. The reversal of 20787756488764 is 46788465778702.

It is a super-2 number, since 2×20787756488764² (a number of 27 digits) contains 22 as substring.

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, 8197063594 + ... + 8197066129.

It is an arithmetic number, because the mean of its divisors is an integer number (3041111063802).

Almost surely, 2^{20787756488764} is an apocalyptic number.

It is an amenable number.

20787756488764 is a deficient number, since it is larger than the sum of its proper divisors (15705576276860).

20787756488764 is a wasteful number, since it uses less digits than its factorization.

20787756488764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16394130044 (or 16394130042 counting only the distinct ones).

The product of its (nonzero) digits is 7080837120, while the sum is 79.

The spelling of 20787756488764 in words is "twenty trillion, seven hundred eighty-seven billion, seven hundred fifty-six million, four hundred eighty-eight thousand, seven hundred sixty-four".