20351005 has 4 divisors (see below), whose sum is σ = 24421212. Its totient is φ = 16280800.

The previous prime is 20350991. The next prime is 20351017. The reversal of 20351005 is 50015302.

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 14333796 + 6017209 = 3786^2 + 2453^2 .

It is not a de Polignac number, because 20351005 - 2⁹ = 20350493 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 20351005.

It is a congruent number.

It is an unprimeable number.

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, 2035096 + ... + 2035105.

It is an arithmetic number, because the mean of its divisors is an integer number (6105303).

Almost surely, 2^20351005 is an apocalyptic number.

It is an amenable number.

20351005 is a deficient number, since it is larger than the sum of its proper divisors (4070207).

20351005 is an equidigital number, since it uses as much as digits as its factorization.

20351005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4070206.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 20351005 is about 4511.2088180442. The cubic root of 20351005 is about 273.0205184344.

Adding to 20351005 its reverse (50015302), we get a palindrome (70366307).

The spelling of 20351005 in words is "twenty million, three hundred fifty-one thousand, five".