20287120247 has 2 divisors, whose sum is σ = 20287120248. Its totient is φ = 20287120246.

The previous prime is 20287120207. The next prime is 20287120253. The reversal of 20287120247 is 74202178202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20287120247 - 2⁸ = 20287119991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20287120207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10143560123 + 10143560124.

It is an arithmetic number, because the mean of its divisors is an integer number (10143560124).

Almost surely, 2^20287120247 is an apocalyptic number.

20287120247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20287120247 is an equidigital number, since it uses as much as digits as its factorization.

20287120247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25088, while the sum is 35.

Adding to 20287120247 its reverse (74202178202), we get a palindrome (94489298449).

The spelling of 20287120247 in words is "twenty billion, two hundred eighty-seven million, one hundred twenty thousand, two hundred forty-seven".