20387741867 has 4 divisors (see below), whose sum is σ = 20421001440. Its totient is φ = 20354482296.

The previous prime is 20387741863. The next prime is 20387741911. The reversal of 20387741867 is 76814778302.

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 20387741867 - 2² = 20387741863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20387741863) 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, 16628867 + ... + 16630092.

It is an arithmetic number, because the mean of its divisors is an integer number (5105250360).

Almost surely, 2^20387741867 is an apocalyptic number.

20387741867 is a deficient number, since it is larger than the sum of its proper divisors (33259573).

20387741867 is an equidigital number, since it uses as much as digits as its factorization.

20387741867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33259572.

The product of its (nonzero) digits is 3161088, while the sum is 53.

The spelling of 20387741867 in words is "twenty billion, three hundred eighty-seven million, seven hundred forty-one thousand, eight hundred sixty-seven".