20430220205 has 4 divisors (see below), whose sum is σ = 24516264252. Its totient is φ = 16344176160.

The previous prime is 20430220201. The next prime is 20430220249. The reversal of 20430220205 is 50202203402.

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 9815657476 + 10614562729 = 99074^2 + 103027^2 .

It is not a de Polignac number, because 20430220205 - 2² = 20430220201 is a prime.

It is a super-3 number, since 3×20430220205³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430220201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2043022016 + ... + 2043022025.

It is an arithmetic number, because the mean of its divisors is an integer number (6129066063).

Almost surely, 2^20430220205 is an apocalyptic number.

It is an amenable number.

20430220205 is a deficient number, since it is larger than the sum of its proper divisors (4086044047).

20430220205 is an equidigital number, since it uses as much as digits as its factorization.

20430220205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4086044046.

The product of its (nonzero) digits is 960, while the sum is 20.

Adding to 20430220205 its reverse (50202203402), we get a palindrome (70632423607).

The spelling of 20430220205 in words is "twenty billion, four hundred thirty million, two hundred twenty thousand, two hundred five".