20533240205 has 4 divisors (see below), whose sum is σ = 24639888252. Its totient is φ = 16426592160.

The previous prime is 20533240193. The next prime is 20533240223. The reversal of 20533240205 is 50204233502.

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 6677831524 + 13855408681 = 81718^2 + 117709^2 .

It is not a de Polignac number, because 20533240205 - 2⁶ = 20533240141 is a prime.

It is a super-2 number, since 2×20533240205² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

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, 2053324016 + ... + 2053324025.

It is an arithmetic number, because the mean of its divisors is an integer number (6159972063).

Almost surely, 2^20533240205 is an apocalyptic number.

It is an amenable number.

20533240205 is a deficient number, since it is larger than the sum of its proper divisors (4106648047).

20533240205 is an equidigital number, since it uses as much as digits as its factorization.

20533240205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4106648046.

The product of its (nonzero) digits is 7200, while the sum is 26.

Adding to 20533240205 its reverse (50204233502), we get a palindrome (70737473707).

The spelling of 20533240205 in words is "twenty billion, five hundred thirty-three million, two hundred forty thousand, two hundred five".