13020581 has 4 divisors (see below), whose sum is σ = 14880672. Its totient is φ = 11160492.

The previous prime is 13020577. The next prime is 13020587. The reversal of 13020581 is 18502031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13020581 - 2² = 13020577 is a prime.

It is a super-2 number, since 2×13020581² = 339071059155122, which 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 (13020587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 930035 + ... + 930048.

It is an arithmetic number, because the mean of its divisors is an integer number (3720168).

Almost surely, 2^13020581 is an apocalyptic number.

It is an amenable number.

13020581 is a deficient number, since it is larger than the sum of its proper divisors (1860091).

13020581 is an equidigital number, since it uses as much as digits as its factorization.

13020581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860090.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 13020581 is about 3608.4042179335. The cubic root of 13020581 is about 235.2574875000.

The spelling of 13020581 in words is "thirteen million, twenty thousand, five hundred eighty-one".