20510255355 has 16 divisors (see below), whose sum is σ = 32818220064. Its totient is φ = 10938199040.

The previous prime is 20510255321. The next prime is 20510255377. The reversal of 20510255355 is 55355201502.

It is not a de Polignac number, because 20510255355 - 2¹⁵ = 20510222587 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 430315 + ... + 475595.

It is an arithmetic number, because the mean of its divisors is an integer number (2051138754).

Almost surely, 2^20510255355 is an apocalyptic number.

20510255355 is a deficient number, since it is larger than the sum of its proper divisors (12307964709).

20510255355 is a wasteful number, since it uses less digits than its factorization.

20510255355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75486.

The product of its (nonzero) digits is 37500, while the sum is 33.

Adding to 20510255355 its reverse (55355201502), we get a palindrome (75865456857).

The spelling of 20510255355 in words is "twenty billion, five hundred ten million, two hundred fifty-five thousand, three hundred fifty-five".