4020205 has 24 divisors (see below), whose sum is σ = 5725080. Its totient is φ = 2701440.

The previous prime is 4020197. The next prime is 4020217. The reversal of 4020205 is 5020204.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 233289 + 3786916 = 483^2 + 1946^2 .

It is not a de Polignac number, because 4020205 - 2³ = 4020197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14811 + ... + 15079.

It is an arithmetic number, because the mean of its divisors is an integer number (238545).

Almost surely, 2^4020205 is an apocalyptic number.

It is an amenable number.

4020205 is a deficient number, since it is larger than the sum of its proper divisors (1704875).

4020205 is a wasteful number, since it uses less digits than its factorization.

4020205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 4020205 is about 2005.0448872781. The cubic root of 4020205 is about 159.0069350772.

Adding to 4020205 its reverse (5020204), we get a palindrome (9040409).

Subtracting 4020205 from its reverse (5020204), we obtain a palindrome (999999).

It can be divided in two parts, 4020 and 205, that added together give a square (4225 = 65²).

The spelling of 4020205 in words is "four million, twenty thousand, two hundred five".