20581741 has 4 divisors (see below), whose sum is σ = 20654752. Its totient is φ = 20508732.

The previous prime is 20581721. The next prime is 20581777. The reversal of 20581741 is 14718502.

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 a cyclic number.

It is not a de Polignac number, because 20581741 - 2⁵ = 20581709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20581721) 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, 36081 + ... + 36646.

It is an arithmetic number, because the mean of its divisors is an integer number (5163688).

Almost surely, 2^20581741 is an apocalyptic number.

It is an amenable number.

20581741 is a deficient number, since it is larger than the sum of its proper divisors (73011).

20581741 is an equidigital number, since it uses as much as digits as its factorization.

20581741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73010.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 20581741 is about 4536.7103720648. The cubic root of 20581741 is about 274.0484623108.

The spelling of 20581741 in words is "twenty million, five hundred eighty-one thousand, seven hundred forty-one".