20013205 has 4 divisors (see below), whose sum is σ = 24015852. Its totient is φ = 16010560.

The previous prime is 20013193. The next prime is 20013221. The reversal of 20013205 is 50231002.

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 7524049 + 12489156 = 2743^2 + 3534^2 .

It is not a de Polignac number, because 20013205 - 2¹⁵ = 19980437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2001316 + ... + 2001325.

It is an arithmetic number, because the mean of its divisors is an integer number (6003963).

Almost surely, 2^20013205 is an apocalyptic number.

It is an amenable number.

20013205 is a deficient number, since it is larger than the sum of its proper divisors (4002647).

20013205 is an equidigital number, since it uses as much as digits as its factorization.

20013205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4002646.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 20013205 is about 4473.6120752698. The cubic root of 20013205 is about 271.5014883243.

Adding to 20013205 its reverse (50231002), we get a palindrome (70244207).

The spelling of 20013205 in words is "twenty million, thirteen thousand, two hundred five".