20686443037504 has 56 divisors (see below), whose sum is σ = 42835321032768. Its totient is φ = 9893310028800.

The previous prime is 20686443037501. The next prime is 20686443037517. The reversal of 20686443037504 is 40573034468602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20686443037501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88876479 + ... + 89108929.

Almost surely, 2^{20686443037504} is an apocalyptic number.

It is an amenable number.

20686443037504 is an abundant number, since it is smaller than the sum of its proper divisors (22148877995264).

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

20686443037504 is a wasteful number, since it uses less digits than its factorization.

20686443037504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292943 (or 292933 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 52.

The spelling of 20686443037504 in words is "twenty trillion, six hundred eighty-six billion, four hundred forty-three million, thirty-seven thousand, five hundred four".