205489970 has 16 divisors (see below), whose sum is σ = 422722368. Its totient is φ = 70453680.

The previous prime is 205489967. The next prime is 205490009. The reversal of 205489970 is 79984502.

It is a happy number.

It is a super-2 number, since 2×205489970² = 84452255541201800, which contains 22 as substring.

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, 1467716 + ... + 1467855.

It is an arithmetic number, because the mean of its divisors is an integer number (26420148).

Almost surely, 2^205489970 is an apocalyptic number.

205489970 is an abundant number, since it is smaller than the sum of its proper divisors (217232398).

205489970 is a wasteful number, since it uses less digits than its factorization.

205489970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2935585.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 205489970 is about 14334.9213461393. The cubic root of 205489970 is about 590.1062434354.

The spelling of 205489970 in words is "two hundred five million, four hundred eighty-nine thousand, nine hundred seventy".