20160060581 has 4 divisors (see below), whose sum is σ = 20162730252. Its totient is φ = 20157390912.

The previous prime is 20160060527. The next prime is 20160060607. The reversal of 20160060581 is 18506006102.

It is a happy number.

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 20109792481 + 50268100 = 141809^2 + 7090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20160060581 is a prime.

It is a super-2 number, since 2×20160060581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20160020581) 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, 1323476 + ... + 1338621.

It is an arithmetic number, because the mean of its divisors is an integer number (5040682563).

Almost surely, 2^20160060581 is an apocalyptic number.

It is an amenable number.

20160060581 is a deficient number, since it is larger than the sum of its proper divisors (2669671).

20160060581 is an equidigital number, since it uses as much as digits as its factorization.

20160060581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2669670.

The product of its (nonzero) digits is 2880, while the sum is 29.

Adding to 20160060581 its reverse (18506006102), we get a palindrome (38666066683).

The spelling of 20160060581 in words is "twenty billion, one hundred sixty million, sixty thousand, five hundred eighty-one".