20633426647 has 4 divisors (see below), whose sum is σ = 20633803936. Its totient is φ = 20633049360.

The previous prime is 20633426603. The next prime is 20633426809. The reversal of 20633426647 is 74662433602.

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 20633426647 - 2²³ = 20625038039 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 (20673426647) 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, 89103 + ... + 221824.

It is an arithmetic number, because the mean of its divisors is an integer number (5158450984).

Almost surely, 2^20633426647 is an apocalyptic number.

20633426647 is a deficient number, since it is larger than the sum of its proper divisors (377289).

20633426647 is an equidigital number, since it uses as much as digits as its factorization.

20633426647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377288.

The product of its (nonzero) digits is 870912, while the sum is 43.

The spelling of 20633426647 in words is "twenty billion, six hundred thirty-three million, four hundred twenty-six thousand, six hundred forty-seven".