205616252620 has 24 divisors (see below), whose sum is σ = 434544418224. Its totient is φ = 81722636736.

The previous prime is 205616252599. The next prime is 205616252623. The reversal of 205616252620 is 26252616502.

It is a self number, because there is not a number n which added to its sum of digits gives 205616252620.

It is not an unprimeable number, because it can be changed into a prime (205616252623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32738302 + ... + 32744581.

It is an arithmetic number, because the mean of its divisors is an integer number (18106017426).

Almost surely, 2^205616252620 is an apocalyptic number.

205616252620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205616252620 is an abundant number, since it is smaller than the sum of its proper divisors (228928165604).

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

205616252620 is a wasteful number, since it uses less digits than its factorization.

205616252620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65483049 (or 65483047 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 205616252620 in words is "two hundred five billion, six hundred sixteen million, two hundred fifty-two thousand, six hundred twenty".