205919972 has 12 divisors (see below), whose sum is σ = 368027520. Its totient is φ = 100769256.

The previous prime is 205919953. The next prime is 205919977. The reversal of 205919972 is 279919502.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (205919977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 547472 + ... + 547847.

It is an arithmetic number, because the mean of its divisors is an integer number (30668960).

Almost surely, 2^205919972 is an apocalyptic number.

It is an amenable number.

205919972 is a deficient number, since it is larger than the sum of its proper divisors (162107548).

205919972 is a wasteful number, since it uses less digits than its factorization.

205919972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095370 (or 1095368 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 205919972 is about 14349.9119161060. The cubic root of 205919972 is about 590.5175693930.

The spelling of 205919972 in words is "two hundred five million, nine hundred nineteen thousand, nine hundred seventy-two".