20367321647 has 4 divisors (see below), whose sum is σ = 20367693480. Its totient is φ = 20366949816.

The previous prime is 20367321617. The next prime is 20367321677. The reversal of 20367321647 is 74612376302.

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

It is an interprime number because it is at equal distance from previous prime (20367321617) and next prime (20367321677).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20367321647 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 (20367321607) 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, 85772 + ... + 219297.

It is an arithmetic number, because the mean of its divisors is an integer number (5091923370).

Almost surely, 2^20367321647 is an apocalyptic number.

20367321647 is a deficient number, since it is larger than the sum of its proper divisors (371833).

20367321647 is an equidigital number, since it uses as much as digits as its factorization.

20367321647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371832.

The product of its (nonzero) digits is 254016, while the sum is 41.

Adding to 20367321647 its reverse (74612376302), we get a palindrome (94979697949).

The spelling of 20367321647 in words is "twenty billion, three hundred sixty-seven million, three hundred twenty-one thousand, six hundred forty-seven".