20513521544420 has 48 divisors (see below), whose sum is σ = 43162820265600. Its totient is φ = 8189329165056.

The previous prime is 20513521544387. The next prime is 20513521544441. The reversal of 20513521544420 is 2444512531502.

It is a super-3 number, since 3×20513521544420³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332586704 + ... + 332648376.

It is an arithmetic number, because the mean of its divisors is an integer number (899225422200).

Almost surely, 2^{20513521544420} is an apocalyptic number.

20513521544420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20513521544420 is an abundant number, since it is smaller than the sum of its proper divisors (22649298721180).

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

20513521544420 is a wasteful number, since it uses less digits than its factorization.

20513521544420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94004 (or 94002 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 38.

The spelling of 20513521544420 in words is "twenty trillion, five hundred thirteen billion, five hundred twenty-one million, five hundred forty-four thousand, four hundred twenty".