20747403644765 has 64 divisors (see below), whose sum is σ = 29749524480000. Its totient is φ = 13591135895040.

The previous prime is 20747403644749. The next prime is 20747403644797. The reversal of 20747403644765 is 56744630474702.

It is not a de Polignac number, because 20747403644765 - 2⁴ = 20747403644749 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 59600186 + ... + 59947284.

It is an arithmetic number, because the mean of its divisors is an integer number (464836320000).

Almost surely, 2^{20747403644765} is an apocalyptic number.

It is an amenable number.

20747403644765 is a deficient number, since it is larger than the sum of its proper divisors (9002120835235).

20747403644765 is a wasteful number, since it uses less digits than its factorization.

20747403644765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347850.

The product of its (nonzero) digits is 94832640, while the sum is 59.

The spelling of 20747403644765 in words is "twenty trillion, seven hundred forty-seven billion, four hundred three million, six hundred forty-four thousand, seven hundred sixty-five".