20386967821 has 4 divisors (see below), whose sum is σ = 22240328544. Its totient is φ = 18533607100.

The previous prime is 20386967819. The next prime is 20386967869. The reversal of 20386967821 is 12876968302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20386967821 - 2¹ = 20386967819 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 (20386967801) 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 3 ways as a sum of consecutive naturals, for example, 926680345 + ... + 926680366.

It is an arithmetic number, because the mean of its divisors is an integer number (5560082136).

Almost surely, 2^20386967821 is an apocalyptic number.

It is an amenable number.

20386967821 is a deficient number, since it is larger than the sum of its proper divisors (1853360723).

20386967821 is a wasteful number, since it uses less digits than its factorization.

20386967821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1853360722.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 20386967821 in words is "twenty billion, three hundred eighty-six million, nine hundred sixty-seven thousand, eight hundred twenty-one".