20405335255 has 4 divisors (see below), whose sum is σ = 24486402312. Its totient is φ = 16324268200.

The previous prime is 20405335217. The next prime is 20405335267. The reversal of 20405335255 is 55253350402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20405335255 - 2⁹ = 20405334743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20405335255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2040533521 + ... + 2040533530.

It is an arithmetic number, because the mean of its divisors is an integer number (6121600578).

Almost surely, 2^20405335255 is an apocalyptic number.

20405335255 is a deficient number, since it is larger than the sum of its proper divisors (4081067057).

20405335255 is an equidigital number, since it uses as much as digits as its factorization.

20405335255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4081067056.

The product of its (nonzero) digits is 90000, while the sum is 34.

Adding to 20405335255 its reverse (55253350402), we get a palindrome (75658685657).

The spelling of 20405335255 in words is "twenty billion, four hundred five million, three hundred thirty-five thousand, two hundred fifty-five".