20538520188500 has 48 divisors (see below), whose sum is σ = 44857096873680. Its totient is φ = 8215230643200.

The previous prime is 20538520188499. The next prime is 20538520188541. The reversal of 20538520188500 is 588102583502.

It can be written as a sum of positive squares in 8 ways, for example, as 8753621657104 + 11784898531396 = 2958652^2 + 3432914^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24085424 + ... + 24923576.

It is an arithmetic number, because the mean of its divisors is an integer number (934522851535).

Almost surely, 2^{20538520188500} is an apocalyptic number.

20538520188500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20538520188500 is an abundant number, since it is smaller than the sum of its proper divisors (24318576685180).

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

20538520188500 is a wasteful number, since it uses less digits than its factorization.

20538520188500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887181 (or 887169 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 47.

The spelling of 20538520188500 in words is "twenty trillion, five hundred thirty-eight billion, five hundred twenty million, one hundred eighty-eight thousand, five hundred".