20688575761 has 16 divisors (see below), whose sum is σ = 24487280640. Its totient is φ = 17111298960.

The previous prime is 20688575759. The next prime is 20688575779. The reversal of 20688575761 is 16757588602.

It is not a de Polignac number, because 20688575761 - 2¹ = 20688575759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20688575711) 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, 419481 + ... + 466198.

It is an arithmetic number, because the mean of its divisors is an integer number (1530455040).

Almost surely, 2^20688575761 is an apocalyptic number.

It is an amenable number.

20688575761 is a deficient number, since it is larger than the sum of its proper divisors (3798704879).

20688575761 is an equidigital number, since it uses as much as digits as its factorization.

20688575761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885804.

The product of its (nonzero) digits is 5644800, while the sum is 55.

The spelling of 20688575761 in words is "twenty billion, six hundred eighty-eight million, five hundred seventy-five thousand, seven hundred sixty-one".