20545305 has 32 divisors (see below), whose sum is σ = 36747648. Its totient is φ = 9715200.

The previous prime is 20545303. The next prime is 20545309. The reversal of 20545305 is 50354502.

It is not a de Polignac number, because 20545305 - 2¹ = 20545303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20545303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5247 + ... + 8283.

It is an arithmetic number, because the mean of its divisors is an integer number (1148364).

Almost surely, 2^20545305 is an apocalyptic number.

It is an amenable number.

20545305 is a deficient number, since it is larger than the sum of its proper divisors (16202343).

20545305 is a wasteful number, since it uses less digits than its factorization.

20545305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3097.

The product of its (nonzero) digits is 3000, while the sum is 24.

The square root of 20545305 is about 4532.6929081949. The cubic root of 20545305 is about 273.8866501512.

Adding to 20545305 its reverse (50354502), we get a palindrome (70899807).

The spelling of 20545305 in words is "twenty million, five hundred forty-five thousand, three hundred five".