20545307 has 8 divisors (see below), whose sum is σ = 20882784. Its totient is φ = 20210688.

The previous prime is 20545303. The next prime is 20545309. The reversal of 20545307 is 70354502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20545307 - 2² = 20545303 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 17243 + ... + 18395.

It is an arithmetic number, because the mean of its divisors is an integer number (2610348).

Almost surely, 2^20545307 is an apocalyptic number.

20545307 is a deficient number, since it is larger than the sum of its proper divisors (337477).

20545307 is a wasteful number, since it uses less digits than its factorization.

20545307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429.

The product of its (nonzero) digits is 4200, while the sum is 26.

The square root of 20545307 is about 4532.6931288143. The cubic root of 20545307 is about 273.8866590384.

Adding to 20545307 its reverse (70354502), we get a palindrome (90899809).

The spelling of 20545307 in words is "twenty million, five hundred forty-five thousand, three hundred seven".