20858727671 has 4 divisors (see below), whose sum is σ = 21008790600. Its totient is φ = 20708664744.

The previous prime is 20858727667. The next prime is 20858727679. The reversal of 20858727671 is 17672785802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20858727671 - 2² = 20858727667 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20858727679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75031256 + ... + 75031533.

It is an arithmetic number, because the mean of its divisors is an integer number (5252197650).

Almost surely, 2^20858727671 is an apocalyptic number.

20858727671 is a deficient number, since it is larger than the sum of its proper divisors (150062929).

20858727671 is a wasteful number, since it uses less digits than its factorization.

20858727671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150062928.

The product of its (nonzero) digits is 2634240, while the sum is 53.

The spelling of 20858727671 in words is "twenty billion, eight hundred fifty-eight million, seven hundred twenty-seven thousand, six hundred seventy-one".