20577159571 has 4 divisors (see below), whose sum is σ = 21240938944. Its totient is φ = 19913380200.

The previous prime is 20577159527. The next prime is 20577159593. The reversal of 20577159571 is 17595177502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20577159571 - 2¹³ = 20577151379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20577159511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331889640 + ... + 331889701.

It is an arithmetic number, because the mean of its divisors is an integer number (5310234736).

Almost surely, 2^20577159571 is an apocalyptic number.

20577159571 is a deficient number, since it is larger than the sum of its proper divisors (663779373).

20577159571 is an equidigital number, since it uses as much as digits as its factorization.

20577159571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663779372.

The product of its (nonzero) digits is 771750, while the sum is 49.

The spelling of 20577159571 in words is "twenty billion, five hundred seventy-seven million, one hundred fifty-nine thousand, five hundred seventy-one".