20684857927 has 16 divisors (see below), whose sum is σ = 23503680000. Its totient is φ = 18097811424.

The previous prime is 20684857909. The next prime is 20684857957. The reversal of 20684857927 is 72975848602.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20684857927 - 2¹⁵ = 20684825159 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 (20684857957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 803427 + ... + 828772.

It is an arithmetic number, because the mean of its divisors is an integer number (1468980000).

Almost surely, 2^20684857927 is an apocalyptic number.

20684857927 is a deficient number, since it is larger than the sum of its proper divisors (2818822073).

20684857927 is a wasteful number, since it uses less digits than its factorization.

20684857927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632270.

The product of its (nonzero) digits is 13547520, while the sum is 58.

The spelling of 20684857927 in words is "twenty billion, six hundred eighty-four million, eight hundred fifty-seven thousand, nine hundred twenty-seven".