3205005620 has 18 divisors (see below), whose sum is σ = 6731043522. Its totient is φ = 1281900976.

The previous prime is 3205005613. The next prime is 3205005641. The reversal of 3205005620 is 265005023.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2564004496 + 641001124 = 50636^2 + 25318^2 .

It is a super-2 number, since 2×3205005620² = 20544122048463168800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 246851 + ... + 259509.

Almost surely, 2^3205005620 is an apocalyptic number.

It is an amenable number.

3205005620 is an abundant number, since it is smaller than the sum of its proper divisors (3526037902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3205005620 is an frugal number, since it uses more digits than its factorization.

3205005620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25327 (or 12666 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 3205005620 is about 56612.7690543397. The cubic root of 3205005620 is about 1474.3805684014.

The spelling of 3205005620 in words is "three billion, two hundred five million, five thousand, six hundred twenty".