20511113205020 has 24 divisors (see below), whose sum is σ = 43076586898800. Its totient is φ = 8203826392832.

The previous prime is 20511113205017. The next prime is 20511113205047. The reversal of 20511113205020 is 2050231111502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38408765 + ... + 38939124.

It is an arithmetic number, because the mean of its divisors is an integer number (1794857787450).

Almost surely, 2^{20511113205020} is an apocalyptic number.

20511113205020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20511113205020 is an abundant number, since it is smaller than the sum of its proper divisors (22565473693780).

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

20511113205020 is a wasteful number, since it uses less digits than its factorization.

20511113205020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77361157 (or 77361155 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 20511113205020 its reverse (2050231111502), we get a palindrome (22561344316522).

The spelling of 20511113205020 in words is "twenty trillion, five hundred eleven billion, one hundred thirteen million, two hundred five thousand, twenty".