205916490 has 192 divisors, whose sum is σ = 621129600. Its totient is φ = 46904832.

The previous prime is 205916449. The next prime is 205916497. The reversal of 205916490 is 94619502.

205916490 is a `hidden beast` number, since 2 + 0 + 5 + 9 + 1 + 649 + 0 = 666.

205916490 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (205916497) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1311492 + ... + 1311648.

It is an arithmetic number, because the mean of its divisors is an integer number (3235050).

Almost surely, 2^205916490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205916490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (310564800).

205916490 is an abundant number, since it is smaller than the sum of its proper divisors (415213110).

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

205916490 is a wasteful number, since it uses less digits than its factorization.

205916490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 205916490 is about 14349.7905908065. The cubic root of 205916490 is about 590.5142409256.

The spelling of 205916490 in words is "two hundred five million, nine hundred sixteen thousand, four hundred ninety".