203105345 has 16 divisors (see below), whose sum is σ = 260077440. Its totient is φ = 151818624.

The previous prime is 203105333. The next prime is 203105347. The reversal of 203105345 is 543501302.

It is a cyclic number.

It is not a de Polignac number, because 203105345 - 2⁶ = 203105281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 203105345.

It is not an unprimeable number, because it can be changed into a prime (203105347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7709 + ... + 21578.

It is an arithmetic number, because the mean of its divisors is an integer number (16254840).

Almost surely, 2^203105345 is an apocalyptic number.

It is an amenable number.

203105345 is a deficient number, since it is larger than the sum of its proper divisors (56972095).

203105345 is a wasteful number, since it uses less digits than its factorization.

203105345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29384.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 203105345 is about 14251.5032540431. The cubic root of 203105345 is about 587.8147111203.

Adding to 203105345 its reverse (543501302), we get a palindrome (746606647).

The spelling of 203105345 in words is "two hundred three million, one hundred five thousand, three hundred forty-five".