20540255331 has 8 divisors (see below), whose sum is σ = 27568378624. Its totient is φ = 13602817800.

The previous prime is 20540255293. The next prime is 20540255371. The reversal of 20540255331 is 13355204502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20540255331 - 2²³ = 20531866723 is a prime.

It is a super-2 number, since 2×20540255331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20540255371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22670911 + ... + 22671816.

It is an arithmetic number, because the mean of its divisors is an integer number (3446047328).

Almost surely, 2^20540255331 is an apocalyptic number.

20540255331 is a deficient number, since it is larger than the sum of its proper divisors (7028123293).

20540255331 is a wasteful number, since it uses less digits than its factorization.

20540255331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45342881.

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 20540255331 its reverse (13355204502), we get a palindrome (33895459833).

The spelling of 20540255331 in words is "twenty billion, five hundred forty million, two hundred fifty-five thousand, three hundred thirty-one".