20040571 has 4 divisors (see below), whose sum is σ = 20339752. Its totient is φ = 19741392.

The previous prime is 20040557. The next prime is 20040577. The reversal of 20040571 is 17504002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20040571 - 2⁷ = 20040443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20040577) 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, 149490 + ... + 149623.

It is an arithmetic number, because the mean of its divisors is an integer number (5084938).

Almost surely, 2^20040571 is an apocalyptic number.

20040571 is a deficient number, since it is larger than the sum of its proper divisors (299181).

20040571 is an equidigital number, since it uses as much as digits as its factorization.

20040571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299180.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 20040571 is about 4476.6696326622. The cubic root of 20040571 is about 271.6251820847.

Adding to 20040571 its reverse (17504002), we get a palindrome (37544573).

The spelling of 20040571 in words is "twenty million, forty thousand, five hundred seventy-one".