20571928805 has 8 divisors (see below), whose sum is σ = 25985594400. Its totient is φ = 15591356496.

The previous prime is 20571928787. The next prime is 20571928829. The reversal of 20571928805 is 50882917502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20571928805 - 2¹⁰ = 20571927781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20571928805.

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, 108273215 + ... + 108273404.

It is an arithmetic number, because the mean of its divisors is an integer number (3248199300).

Almost surely, 2^20571928805 is an apocalyptic number.

It is an amenable number.

20571928805 is a deficient number, since it is larger than the sum of its proper divisors (5413665595).

20571928805 is a wasteful number, since it uses less digits than its factorization.

20571928805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216546643.

The product of its (nonzero) digits is 403200, while the sum is 47.

The spelling of 20571928805 in words is "twenty billion, five hundred seventy-one million, nine hundred twenty-eight thousand, eight hundred five".