205663420 has 12 divisors (see below), whose sum is σ = 431893224. Its totient is φ = 82265360.

The previous prime is 205663397. The next prime is 205663463. The reversal of 205663420 is 24366502.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5141566 + ... + 5141605.

It is an arithmetic number, because the mean of its divisors is an integer number (35991102).

Almost surely, 2^205663420 is an apocalyptic number.

205663420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205663420 is an abundant number, since it is smaller than the sum of its proper divisors (226229804).

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

205663420 is a wasteful number, since it uses less digits than its factorization.

205663420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10283180 (or 10283178 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 205663420 is about 14340.9699811414. The cubic root of 205663420 is about 590.2722290601.

The spelling of 205663420 in words is "two hundred five million, six hundred sixty-three thousand, four hundred twenty".