205420547 has 2 divisors, whose sum is σ = 205420548. Its totient is φ = 205420546.

The previous prime is 205420541. The next prime is 205420549. The reversal of 205420547 is 745024502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205420547 - 2⁶ = 205420483 is a prime.

It is a super-2 number, since 2×205420547² = 84395202259558418, which contains 22 as substring.

Together with 205420549, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (205420541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102710273 + 102710274.

It is an arithmetic number, because the mean of its divisors is an integer number (102710274).

Almost surely, 2^205420547 is an apocalyptic number.

205420547 is a deficient number, since it is larger than the sum of its proper divisors (1).

205420547 is an equidigital number, since it uses as much as digits as its factorization.

205420547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 205420547 is about 14332.4996773068. The cubic root of 205420547 is about 590.0397818622.

The spelling of 205420547 in words is "two hundred five million, four hundred twenty thousand, five hundred forty-seven".