20205305271 has 24 divisors (see below), whose sum is σ = 30239015040. Its totient is φ = 12987172800.

The previous prime is 20205305249. The next prime is 20205305291. The reversal of 20205305271 is 17250350202.

It is not a de Polignac number, because 20205305271 - 2³⁴ = 3025436087 is a prime.

It is a super-2 number, since 2×20205305271² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205305231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59560 + ... + 209661.

It is an arithmetic number, because the mean of its divisors is an integer number (1259958960).

Almost surely, 2^20205305271 is an apocalyptic number.

20205305271 is a deficient number, since it is larger than the sum of its proper divisors (10033709769).

20205305271 is a wasteful number, since it uses less digits than its factorization.

20205305271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269527 (or 269524 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

Adding to 20205305271 its reverse (17250350202), we get a palindrome (37455655473).

The spelling of 20205305271 in words is "twenty billion, two hundred five million, three hundred five thousand, two hundred seventy-one".