20326415647 has 4 divisors (see below), whose sum is σ = 20326945896. Its totient is φ = 20325885400.

The previous prime is 20326415639. The next prime is 20326415651. The reversal of 20326415647 is 74651462302.

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 20326415647 - 2³ = 20326415639 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 (20326415657) 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, 202729 + ... + 285922.

It is an arithmetic number, because the mean of its divisors is an integer number (5081736474).

Almost surely, 2^20326415647 is an apocalyptic number.

20326415647 is a deficient number, since it is larger than the sum of its proper divisors (530249).

20326415647 is an equidigital number, since it uses as much as digits as its factorization.

20326415647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530248.

The product of its (nonzero) digits is 241920, while the sum is 40.

Adding to 20326415647 its reverse (74651462302), we get a palindrome (94977877949).

The spelling of 20326415647 in words is "twenty billion, three hundred twenty-six million, four hundred fifteen thousand, six hundred forty-seven".