20863105 has 4 divisors (see below), whose sum is σ = 25035732. Its totient is φ = 16690480.

The previous prime is 20863103. The next prime is 20863111. The reversal of 20863105 is 50136802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12383361 + 8479744 = 3519^2 + 2912^2 .

It is not a de Polignac number, because 20863105 - 2¹ = 20863103 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20863105.

It is not an unprimeable number, because it can be changed into a prime (20863103) 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 in 3 ways as a sum of consecutive naturals, for example, 2086306 + ... + 2086315.

It is an arithmetic number, because the mean of its divisors is an integer number (6258933).

Almost surely, 2^20863105 is an apocalyptic number.

It is an amenable number.

20863105 is a deficient number, since it is larger than the sum of its proper divisors (4172627).

20863105 is an equidigital number, since it uses as much as digits as its factorization.

20863105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4172626.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20863105 is about 4567.6148042496. The cubic root of 20863105 is about 275.2916135250.

Adding to 20863105 its reverse (50136802), we get a palindrome (70999907).

The spelling of 20863105 in words is "twenty million, eight hundred sixty-three thousand, one hundred five".