20571181851 has 16 divisors (see below), whose sum is σ = 30196235520. Its totient is φ = 12353001120.

The previous prime is 20571181837. The next prime is 20571181859. The reversal of 20571181851 is 15818117502.

It is not a de Polignac number, because 20571181851 - 2¹¹ = 20571179803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20571181859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2855895 + ... + 2863088.

It is an arithmetic number, because the mean of its divisors is an integer number (1887264720).

Almost surely, 2^20571181851 is an apocalyptic number.

20571181851 is a deficient number, since it is larger than the sum of its proper divisors (9625053669).

20571181851 is a wasteful number, since it uses less digits than its factorization.

20571181851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5719106.

The product of its (nonzero) digits is 22400, while the sum is 39.

The spelling of 20571181851 in words is "twenty billion, five hundred seventy-one million, one hundred eighty-one thousand, eight hundred fifty-one".