20255535520 has 72 divisors (see below), whose sum is σ = 52599574692. Its totient is φ = 7365642240.

The previous prime is 20255535451. The next prime is 20255535533. The reversal of 20255535520 is 2553555202.

It can be written as a sum of positive squares in 2 ways, for example, as 16928091664 + 3327443856 = 130108^2 + 57684^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

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 11 ways as a sum of consecutive naturals, for example, 503769 + ... + 542488.

Almost surely, 2^20255535520 is an apocalyptic number.

20255535520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20255535520 is an abundant number, since it is smaller than the sum of its proper divisors (32344039172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20255535520 is a wasteful number, since it uses less digits than its factorization.

20255535520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046294 (or 1046275 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 34.

The spelling of 20255535520 in words is "twenty billion, two hundred fifty-five million, five hundred thirty-five thousand, five hundred twenty".