20387871771 has 8 divisors (see below), whose sum is σ = 27242040384. Its totient is φ = 13562808840.

The previous prime is 20387871767. The next prime is 20387871787. The reversal of 20387871771 is 17717878302.

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

It is not a de Polignac number, because 20387871771 - 2² = 20387871767 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20387871671) 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, 7274785 + ... + 7277586.

It is an arithmetic number, because the mean of its divisors is an integer number (3405255048).

Almost surely, 2^20387871771 is an apocalyptic number.

20387871771 is a deficient number, since it is larger than the sum of its proper divisors (6854168613).

20387871771 is a wasteful number, since it uses less digits than its factorization.

20387871771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14552841.

The product of its (nonzero) digits is 921984, while the sum is 51.

The spelling of 20387871771 in words is "twenty billion, three hundred eighty-seven million, eight hundred seventy-one thousand, seven hundred seventy-one".