205420403 has 4 divisors (see below), whose sum is σ = 206919960. Its totient is φ = 203920848.

The previous prime is 205420363. The next prime is 205420433. The reversal of 205420403 is 304024502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205420403 - 2¹⁶ = 205354867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205420433) 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, 749573 + ... + 749846.

It is an arithmetic number, because the mean of its divisors is an integer number (51729990).

Almost surely, 2^205420403 is an apocalyptic number.

205420403 is a deficient number, since it is larger than the sum of its proper divisors (1499557).

205420403 is a wasteful number, since it uses less digits than its factorization.

205420403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499556.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 205420403 is about 14332.4946537579. The cubic root of 205420403 is about 590.0396439894.

Adding to 205420403 its reverse (304024502), we get a palindrome (509444905).

The spelling of 205420403 in words is "two hundred five million, four hundred twenty thousand, four hundred three".