20081574565464 has 32 divisors (see below), whose sum is σ = 50721502774320. Its totient is φ = 6624849340416.

The previous prime is 20081574565439. The next prime is 20081574565471. The reversal of 20081574565464 is 46456547518002.

It is a happy number.

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, 4313050629 + ... + 4313055284.

Almost surely, 2^{20081574565464} is an apocalyptic number.

20081574565464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20081574565464 is an abundant number, since it is smaller than the sum of its proper divisors (30639928208856).

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

20081574565464 is a wasteful number, since it uses less digits than its factorization.

20081574565464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8626106019 (or 8626106015 counting only the distinct ones).

The product of its (nonzero) digits is 32256000, while the sum is 57.

The spelling of 20081574565464 in words is "twenty trillion, eighty-one billion, five hundred seventy-four million, five hundred sixty-five thousand, four hundred sixty-four".