20650665047 has 4 divisors (see below), whose sum is σ = 20651376480. Its totient is φ = 20649953616.

The previous prime is 20650665043. The next prime is 20650665053. The reversal of 20650665047 is 74056605602.

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 20650665047 - 2² = 20650665043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20650664995 and 20650665013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20650665043) 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, 310238 + ... + 370875.

It is an arithmetic number, because the mean of its divisors is an integer number (5162844120).

Almost surely, 2^20650665047 is an apocalyptic number.

20650665047 is a deficient number, since it is larger than the sum of its proper divisors (711433).

20650665047 is an equidigital number, since it uses as much as digits as its factorization.

20650665047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711432.

The product of its (nonzero) digits is 302400, while the sum is 41.

The spelling of 20650665047 in words is "twenty billion, six hundred fifty million, six hundred sixty-five thousand, forty-seven".