205498540 has 24 divisors (see below), whose sum is σ = 464743440. Its totient is φ = 75876288.

The previous prime is 205498507. The next prime is 205498549. The reversal of 205498540 is 45894502.

It is a self number, because there is not a number n which added to its sum of digits gives 205498540.

It is not an unprimeable number, because it can be changed into a prime (205498549) 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, 394930 + ... + 395449.

It is an arithmetic number, because the mean of its divisors is an integer number (19364310).

Almost surely, 2^205498540 is an apocalyptic number.

205498540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205498540 is an abundant number, since it is smaller than the sum of its proper divisors (259244900).

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

205498540 is a wasteful number, since it uses less digits than its factorization.

205498540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790401 (or 790399 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 205498540 is about 14335.2202633932. The cubic root of 205498540 is about 590.1144468207.

The spelling of 205498540 in words is "two hundred five million, four hundred ninety-eight thousand, five hundred forty".