2020405 has 4 divisors (see below), whose sum is σ = 2424492. Its totient is φ = 1616320.

The previous prime is 2020393. The next prime is 2020409. The reversal of 2020405 is 5040202.

It is a happy number.

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 1285956 + 734449 = 1134^2 + 857^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2020405 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 (2020409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202036 + ... + 202045.

It is an arithmetic number, because the mean of its divisors is an integer number (606123).

2^2020405 is an apocalyptic number.

It is an amenable number.

2020405 is a deficient number, since it is larger than the sum of its proper divisors (404087).

2020405 is an equidigital number, since it uses as much as digits as its factorization.

2020405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404086.

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

The square root of 2020405 is about 1421.4095117172. The cubic root of 2020405 is about 126.4191341607.

Adding to 2020405 its reverse (5040202), we get a palindrome (7060607).

The spelling of 2020405 in words is "two million, twenty thousand, four hundred five".