20718404005 has 32 divisors (see below), whose sum is σ = 27537205248. Its totient is φ = 14865120000.

The previous prime is 20718403991. The next prime is 20718404027. The reversal of 20718404005 is 50040481702.

It is not a de Polignac number, because 20718404005 - 2²³ = 20710015397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1800420 + ... + 1811890.

It is an arithmetic number, because the mean of its divisors is an integer number (860537664).

Almost surely, 2^20718404005 is an apocalyptic number.

It is an amenable number.

20718404005 is a deficient number, since it is larger than the sum of its proper divisors (6818801243).

20718404005 is a wasteful number, since it uses less digits than its factorization.

20718404005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12277.

The product of its (nonzero) digits is 8960, while the sum is 31.

Adding to 20718404005 its reverse (50040481702), we get a palindrome (70758885707).

The spelling of 20718404005 in words is "twenty billion, seven hundred eighteen million, four hundred four thousand, five".