205012603 has 4 divisors (see below), whose sum is σ = 215802760. Its totient is φ = 194222448.

The previous prime is 205012601. The next prime is 205012607. The reversal of 205012603 is 306210502.

It is a happy number.

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 205012603 - 2¹ = 205012601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 10790137 = 205012603 / (2 + 0 + 5 + 0 + 1 + 2 + 6 + 0 + 3).

It is not an unprimeable number, because it can be changed into a prime (205012601) 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, 5395050 + ... + 5395087.

It is an arithmetic number, because the mean of its divisors is an integer number (53950690).

Almost surely, 2^205012603 is an apocalyptic number.

205012603 is a deficient number, since it is larger than the sum of its proper divisors (10790157).

205012603 is a wasteful number, since it uses less digits than its factorization.

205012603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10790156.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 205012603 is about 14318.2611723631. The cubic root of 205012603 is about 589.6489369905.

It can be divided in two parts, 20501 and 2603, that added together give a square (23104 = 152²).

The spelling of 205012603 in words is "two hundred five million, twelve thousand, six hundred three".