20611043 has 4 divisors (see below), whose sum is σ = 20696808. Its totient is φ = 20525280.

The previous prime is 20611033. The next prime is 20611057. The reversal of 20611043 is 34011602.

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 20611043 - 2⁶ = 20610979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20611033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42521 + ... + 43002.

It is an arithmetic number, because the mean of its divisors is an integer number (5174202).

Almost surely, 2^20611043 is an apocalyptic number.

20611043 is a deficient number, since it is larger than the sum of its proper divisors (85765).

20611043 is an equidigital number, since it uses as much as digits as its factorization.

20611043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85764.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20611043 is about 4539.9386559732. The cubic root of 20611043 is about 274.1784539092.

Adding to 20611043 its reverse (34011602), we get a palindrome (54622645).

The spelling of 20611043 in words is "twenty million, six hundred eleven thousand, forty-three".