20519686613440 has 168 divisors, whose sum is σ = 57168618171552. Its totient is φ = 6994653603840.

The previous prime is 20519686613417. The next prime is 20519686613467. The reversal of 20519686613440 is 4431668691502.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 1069596 + ... + 6494875.

Almost surely, 2^{20519686613440} is an apocalyptic number.

20519686613440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20519686613440 is an abundant number, since it is smaller than the sum of its proper divisors (36648931558112).

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

20519686613440 is a wasteful number, since it uses less digits than its factorization.

20519686613440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7564675 (or 7564658 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 55.

The spelling of 20519686613440 in words is "twenty trillion, five hundred nineteen billion, six hundred eighty-six million, six hundred thirteen thousand, four hundred forty".