20457759566 has 8 divisors (see below), whose sum is σ = 30777698640. Its totient is φ = 10198526688.

The previous prime is 20457759551. The next prime is 20457759571. The reversal of 20457759566 is 66595775402.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15175706 + ... + 15177053.

It is an arithmetic number, because the mean of its divisors is an integer number (3847212330).

Almost surely, 2^20457759566 is an apocalyptic number.

20457759566 is a deficient number, since it is larger than the sum of its proper divisors (10319939074).

20457759566 is a wasteful number, since it uses less digits than its factorization.

20457759566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30353098.

The product of its (nonzero) digits is 15876000, while the sum is 56.

The spelling of 20457759566 in words is "twenty billion, four hundred fifty-seven million, seven hundred fifty-nine thousand, five hundred sixty-six".