20442511 has 2 divisors, whose sum is σ = 20442512. Its totient is φ = 20442510.

The previous prime is 20442479. The next prime is 20442523. The reversal of 20442511 is 11524402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20442511 - 2⁵ = 20442479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20442581) 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 as a sum of consecutive naturals, namely, 10221255 + 10221256.

It is an arithmetic number, because the mean of its divisors is an integer number (10221256).

Almost surely, 2^20442511 is an apocalyptic number.

20442511 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442511 is an equidigital number, since it uses as much as digits as its factorization.

20442511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 20442511 is about 4521.3395139051. The cubic root of 20442511 is about 273.4291086470.

Adding to 20442511 its reverse (11524402), we get a palindrome (31966913).

The spelling of 20442511 in words is "twenty million, four hundred forty-two thousand, five hundred eleven".