20402440567 has 2 divisors, whose sum is σ = 20402440568. Its totient is φ = 20402440566.

The previous prime is 20402440549. The next prime is 20402440621. The reversal of 20402440567 is 76504420402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20402440567 - 2⁷ = 20402440439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20402440517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201220283 + 10201220284.

It is an arithmetic number, because the mean of its divisors is an integer number (10201220284).

Almost surely, 2^20402440567 is an apocalyptic number.

20402440567 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402440567 is an equidigital number, since it uses as much as digits as its factorization.

20402440567 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 34.

Adding to 20402440567 its reverse (76504420402), we get a palindrome (96906860969).

The spelling of 20402440567 in words is "twenty billion, four hundred two million, four hundred forty thousand, five hundred sixty-seven".