3685020205 has 4 divisors (see below), whose sum is σ = 4422024252. Its totient is φ = 2948016160.

The previous prime is 3685020197. The next prime is 3685020211. The reversal of 3685020205 is 5020205863.

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 1431714244 + 2253305961 = 37838^2 + 47469^2 .

It is not a de Polignac number, because 3685020205 - 2³ = 3685020197 is a prime.

It is a super-2 number, since 2×3685020205² = 27158747822516484050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) 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, 368502016 + ... + 368502025.

It is an arithmetic number, because the mean of its divisors is an integer number (1105506063).

Almost surely, 2^3685020205 is an apocalyptic number.

It is an amenable number.

3685020205 is a deficient number, since it is larger than the sum of its proper divisors (737004047).

3685020205 is an equidigital number, since it uses as much as digits as its factorization.

3685020205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737004046.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 3685020205 is about 60704.3672646376. The cubic root of 3685020205 is about 1544.5902573151.

The spelling of 3685020205 in words is "three billion, six hundred eighty-five million, twenty thousand, two hundred five".