20286057521 has 4 divisors (see below), whose sum is σ = 20331238500. Its totient is φ = 20240876544.

The previous prime is 20286057479. The next prime is 20286057553. The reversal of 20286057521 is 12575068202.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15150901921 + 5135155600 = 123089^2 + 71660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20286057521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20286051521) 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, 22589816 + ... + 22590713.

It is an arithmetic number, because the mean of its divisors is an integer number (5082809625).

Almost surely, 2^20286057521 is an apocalyptic number.

It is an amenable number.

20286057521 is a deficient number, since it is larger than the sum of its proper divisors (45180979).

20286057521 is an equidigital number, since it uses as much as digits as its factorization.

20286057521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45180978.

The product of its (nonzero) digits is 67200, while the sum is 38.

The spelling of 20286057521 in words is "twenty billion, two hundred eighty-six million, fifty-seven thousand, five hundred twenty-one".