20581043 has 8 divisors (see below), whose sum is σ = 23549280. Its totient is φ = 17619840.

The previous prime is 20581037. The next prime is 20581049. The reversal of 20581043 is 34018502.

It is an interprime number because it is at equal distance from previous prime (20581037) and next prime (20581049).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20581043 - 2⁴ = 20581027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20581049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8603 + ... + 10731.

It is an arithmetic number, because the mean of its divisors is an integer number (2943660).

Almost surely, 2^20581043 is an apocalyptic number.

20581043 is a deficient number, since it is larger than the sum of its proper divisors (2968237).

20581043 is a wasteful number, since it uses less digits than its factorization.

20581043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3517.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20581043 is about 4536.6334434248. The cubic root of 20581043 is about 274.0453642900.

Adding to 20581043 its reverse (34018502), we get a palindrome (54599545).

The spelling of 20581043 in words is "twenty million, five hundred eighty-one thousand, forty-three".