20553443 has 2 divisors, whose sum is σ = 20553444. Its totient is φ = 20553442.

The previous prime is 20553433. The next prime is 20553451. The reversal of 20553443 is 34435502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20553443 - 2¹⁴ = 20537059 is a prime.

It is not a weakly prime, because it can be changed into another prime (20553433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10276721 + 10276722.

It is an arithmetic number, because the mean of its divisors is an integer number (10276722).

Almost surely, 2^20553443 is an apocalyptic number.

20553443 is a deficient number, since it is larger than the sum of its proper divisors (1).

20553443 is an equidigital number, since it uses as much as digits as its factorization.

20553443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 20553443 is about 4533.5905196654. The cubic root of 20553443 is about 273.9228075658.

Adding to 20553443 its reverse (34435502), we get a palindrome (54988945).

The spelling of 20553443 in words is "twenty million, five hundred fifty-three thousand, four hundred forty-three".