20663048791 has 16 divisors (see below), whose sum is σ = 26592749568. Its totient is φ = 15581685600.

The previous prime is 20663048789. The next prime is 20663048849. The reversal of 20663048791 is 19784036602.

It is a cyclic number.

It is not a de Polignac number, because 20663048791 - 2¹ = 20663048789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20663045791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4325860 + ... + 4330633.

It is an arithmetic number, because the mean of its divisors is an integer number (1662046848).

Almost surely, 2^20663048791 is an apocalyptic number.

20663048791 is a deficient number, since it is larger than the sum of its proper divisors (5929700777).

20663048791 is a wasteful number, since it uses less digits than its factorization.

20663048791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8656542.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 20663048791 in words is "twenty billion, six hundred sixty-three million, forty-eight thousand, seven hundred ninety-one".