20508158571 has 8 divisors (see below), whose sum is σ = 27353451840. Its totient is φ = 13667485512.

The previous prime is 20508158557. The next prime is 20508158621. The reversal of 20508158571 is 17585180502.

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

It is not a de Polignac number, because 20508158571 - 2²³ = 20499769963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20508158521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1144681 + ... + 1162458.

It is an arithmetic number, because the mean of its divisors is an integer number (3419181480).

Almost surely, 2^20508158571 is an apocalyptic number.

20508158571 is a deficient number, since it is larger than the sum of its proper divisors (6845293269).

20508158571 is a wasteful number, since it uses less digits than its factorization.

20508158571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2310105.

The product of its (nonzero) digits is 112000, while the sum is 42.

The spelling of 20508158571 in words is "twenty billion, five hundred eight million, one hundred fifty-eight thousand, five hundred seventy-one".