205555540 has 24 divisors (see below), whose sum is σ = 433319040. Its totient is φ = 81907488.

The previous prime is 205555507. The next prime is 205555549. The reversal of 205555540 is 45555502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205555549) 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, 14280 + ... + 24799.

It is an arithmetic number, because the mean of its divisors is an integer number (18054960).

Almost surely, 2^205555540 is an apocalyptic number.

205555540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205555540 is an abundant number, since it is smaller than the sum of its proper divisors (227763500).

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

205555540 is a wasteful number, since it uses less digits than its factorization.

205555540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39351 (or 39349 counting only the distinct ones).

The product of its (nonzero) digits is 25000, while the sum is 31.

The square root of 205555540 is about 14337.2082359154. The cubic root of 205555540 is about 590.1690026244.

The spelling of 205555540 in words is "two hundred five million, five hundred fifty-five thousand, five hundred forty".