20775471887 has 8 divisors (see below), whose sum is σ = 21286157904. Its totient is φ = 20266037568.

The previous prime is 20775471869. The next prime is 20775471889. The reversal of 20775471887 is 78817457702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20775471887 - 2⁸ = 20775471631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20775471889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279278 + ... + 345755.

It is an arithmetic number, because the mean of its divisors is an integer number (2660769738).

Almost surely, 2^20775471887 is an apocalyptic number.

20775471887 is a deficient number, since it is larger than the sum of its proper divisors (510686017).

20775471887 is an equidigital number, since it uses as much as digits as its factorization.

20775471887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625849.

The product of its (nonzero) digits is 6146560, while the sum is 56.

The spelling of 20775471887 in words is "twenty billion, seven hundred seventy-five million, four hundred seventy-one thousand, eight hundred eighty-seven".