205420545 has 24 divisors (see below), whose sum is σ = 388432512. Its totient is φ = 99597600.

The previous prime is 205420541. The next prime is 205420547. The reversal of 205420545 is 545024502.

It is not a de Polignac number, because 205420545 - 2² = 205420541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205420541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 207001 + ... + 207990.

It is an arithmetic number, because the mean of its divisors is an integer number (16184688).

Almost surely, 2^205420545 is an apocalyptic number.

It is an amenable number.

205420545 is a deficient number, since it is larger than the sum of its proper divisors (183011967).

205420545 is a wasteful number, since it uses less digits than its factorization.

205420545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415013 (or 415010 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

The square root of 205420545 is about 14332.4996075353. The cubic root of 205420545 is about 590.0397799473.

The spelling of 205420545 in words is "two hundred five million, four hundred twenty thousand, five hundred forty-five".