20006035405 has 4 divisors (see below), whose sum is σ = 24007242492. Its totient is φ = 16004828320.

The previous prime is 20006035397. The next prime is 20006035409. The reversal of 20006035405 is 50453060002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7498520836 + 12507514569 = 86594^2 + 111837^2 .

It is not a de Polignac number, because 20006035405 - 2³ = 20006035397 is a prime.

It is a super-2 number, since 2×20006035405² (a number of 21 digits) contains 22 as substring.

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 20006035405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20006035409) 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, 2000603536 + ... + 2000603545.

It is an arithmetic number, because the mean of its divisors is an integer number (6001810623).

Almost surely, 2^20006035405 is an apocalyptic number.

It is an amenable number.

20006035405 is a deficient number, since it is larger than the sum of its proper divisors (4001207087).

20006035405 is an equidigital number, since it uses as much as digits as its factorization.

20006035405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4001207086.

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 20006035405 its reverse (50453060002), we get a palindrome (70459095407).

The spelling of 20006035405 in words is "twenty billion, six million, thirty-five thousand, four hundred five".