20255005 has 4 divisors (see below), whose sum is σ = 24306012. Its totient is φ = 16204000.

The previous prime is 20255003. The next prime is 20255009. The reversal of 20255005 is 50055202.

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 14699556 + 5555449 = 3834^2 + 2357^2 .

It is not a de Polignac number, because 20255005 - 2¹ = 20255003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20255003) 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, 2025496 + ... + 2025505.

It is an arithmetic number, because the mean of its divisors is an integer number (6076503).

Almost surely, 2^20255005 is an apocalyptic number.

It is an amenable number.

20255005 is a deficient number, since it is larger than the sum of its proper divisors (4051007).

20255005 is an equidigital number, since it uses as much as digits as its factorization.

20255005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4051006.

The product of its (nonzero) digits is 500, while the sum is 19.

The square root of 20255005 is about 4500.5560767532. The cubic root of 20255005 is about 272.5905430961.

It can be divided in two parts, 20 and 255005, that added together give a square (255025 = 505²).

The spelling of 20255005 in words is "twenty million, two hundred fifty-five thousand, five".