20615443 has 2 divisors, whose sum is σ = 20615444. Its totient is φ = 20615442.

The previous prime is 20615417. The next prime is 20615453. The reversal of 20615443 is 34451602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20615443 - 2⁵ = 20615411 is a prime.

It is not a weakly prime, because it can be changed into another prime (20615453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10307721 + 10307722.

It is an arithmetic number, because the mean of its divisors is an integer number (10307722).

Almost surely, 2^20615443 is an apocalyptic number.

20615443 is a deficient number, since it is larger than the sum of its proper divisors (1).

20615443 is an equidigital number, since it uses as much as digits as its factorization.

20615443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20615443 is about 4540.4232181593. The cubic root of 20615443 is about 274.1979628583.

The spelling of 20615443 in words is "twenty million, six hundred fifteen thousand, four hundred forty-three".