20531255305 has 8 divisors (see below), whose sum is σ = 26877279744. Its totient is φ = 14931822000.

The previous prime is 20531255299. The next prime is 20531255357. The reversal of 20531255305 is 50355213502.

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

It is not a de Polignac number, because 20531255305 - 2¹¹ = 20531253257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186647721 + ... + 186647830.

It is an arithmetic number, because the mean of its divisors is an integer number (3359659968).

Almost surely, 2^20531255305 is an apocalyptic number.

It is an amenable number.

20531255305 is a deficient number, since it is larger than the sum of its proper divisors (6346024439).

20531255305 is a wasteful number, since it uses less digits than its factorization.

20531255305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373295567.

The product of its (nonzero) digits is 22500, while the sum is 31.

Adding to 20531255305 its reverse (50355213502), we get a palindrome (70886468807).

The spelling of 20531255305 in words is "twenty billion, five hundred thirty-one million, two hundred fifty-five thousand, three hundred five".