205352780 has 24 divisors (see below), whose sum is σ = 432060720. Its totient is φ = 81984960.

The previous prime is 205352761. The next prime is 205352827. The reversal of 205352780 is 87253502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1331 + ... + 20309.

It is an arithmetic number, because the mean of its divisors is an integer number (18002530).

Almost surely, 2^205352780 is an apocalyptic number.

205352780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205352780 is an abundant number, since it is smaller than the sum of its proper divisors (226707940).

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

205352780 is a wasteful number, since it uses less digits than its factorization.

205352780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19529 (or 19527 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 205352780 is about 14330.1353796815. The cubic root of 205352780 is about 589.9748912038.

The spelling of 205352780 in words is "two hundred five million, three hundred fifty-two thousand, seven hundred eighty".