20105573 has 2 divisors, whose sum is σ = 20105574. Its totient is φ = 20105572.

The previous prime is 20105551. The next prime is 20105597. The reversal of 20105573 is 37550102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17123044 + 2982529 = 4138^2 + 1727^2 .

It is a cyclic number.

It is not a de Polignac number, because 20105573 - 2⁸ = 20105317 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20105273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10052786 + 10052787.

It is an arithmetic number, because the mean of its divisors is an integer number (10052787).

Almost surely, 2^20105573 is an apocalyptic number.

It is an amenable number.

20105573 is a deficient number, since it is larger than the sum of its proper divisors (1).

20105573 is an equidigital number, since it uses as much as digits as its factorization.

20105573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 20105573 is about 4483.9238396744. The cubic root of 20105573 is about 271.9185390790.

Adding to 20105573 its reverse (37550102), we get a palindrome (57655675).

The spelling of 20105573 in words is "twenty million, one hundred five thousand, five hundred seventy-three".