20081861475841 has 27 divisors (see below), whose sum is σ = 22162286774817. Its totient is φ = 18183058419240.

The previous prime is 20081861475817. The next prime is 20081861475899. The reversal of 20081861475841 is 14857416818002.

The square root of 20081861475841 is 4481279.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 20081861475841 - 2¹³ = 20081861467649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20081861475811) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 15133278520 + ... + 15133279846.

Almost surely, 2^{20081861475841} is an apocalyptic number.

20081861475841 is the 4481279-th square number.

20081861475841 is the 2240640-th centered octagonal number.

It is an amenable number.

20081861475841 is a deficient number, since it is larger than the sum of its proper divisors (2080425298976).

20081861475841 is an frugal number, since it uses more digits than its factorization.

20081861475841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3290 (or 1645 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 55.

The spelling of 20081861475841 in words is "twenty trillion, eighty-one billion, eight hundred sixty-one million, four hundred seventy-five thousand, eight hundred forty-one".