20571459664 has 20 divisors (see below), whose sum is σ = 45551089504. Its totient is φ = 8816339808.

The previous prime is 20571459599. The next prime is 20571459673. The reversal of 20571459664 is 46695417502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91836762 + ... + 91836985.

Almost surely, 2^20571459664 is an apocalyptic number.

It is an amenable number.

20571459664 is an abundant number, since it is smaller than the sum of its proper divisors (24979629840).

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

20571459664 is a wasteful number, since it uses less digits than its factorization.

20571459664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183673762 (or 183673756 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 49.

The spelling of 20571459664 in words is "twenty billion, five hundred seventy-one million, four hundred fifty-nine thousand, six hundred sixty-four".