20435040047 has 4 divisors (see below), whose sum is σ = 20693711520. Its totient is φ = 20176368576.

The previous prime is 20435040019. The next prime is 20435040053. The reversal of 20435040047 is 74004053402.

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 20435040047 - 2⁸ = 20435039791 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 (20435048047) 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, 129335618 + ... + 129335775.

It is an arithmetic number, because the mean of its divisors is an integer number (5173427880).

Almost surely, 2^20435040047 is an apocalyptic number.

20435040047 is a deficient number, since it is larger than the sum of its proper divisors (258671473).

20435040047 is an equidigital number, since it uses as much as digits as its factorization.

20435040047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258671472.

The product of its (nonzero) digits is 13440, while the sum is 29.

Adding to 20435040047 its reverse (74004053402), we get a palindrome (94439093449).

The spelling of 20435040047 in words is "twenty billion, four hundred thirty-five million, forty thousand, forty-seven".