20265205 has 4 divisors (see below), whose sum is σ = 24318252. Its totient is φ = 16212160.

The previous prime is 20265199. The next prime is 20265247. The reversal of 20265205 is 50256202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50256202 = 2 ⋅25128101.

It can be written as a sum of positive squares in 2 ways, for example, as 6180196 + 14085009 = 2486^2 + 3753^2 .

It is not a de Polignac number, because 20265205 - 2⁹ = 20264693 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 2026516 + ... + 2026525.

It is an arithmetic number, because the mean of its divisors is an integer number (6079563).

Almost surely, 2^20265205 is an apocalyptic number.

It is an amenable number.

20265205 is a deficient number, since it is larger than the sum of its proper divisors (4053047).

20265205 is an equidigital number, since it uses as much as digits as its factorization.

20265205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4053046.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20265205 is about 4501.6891274276. The cubic root of 20265205 is about 272.6362923969.

It can be divided in two parts, 20 and 265205, that added together give a square (265225 = 515²).

The spelling of 20265205 in words is "twenty million, two hundred sixty-five thousand, two hundred five".