20307345 has 16 divisors (see below), whose sum is σ = 32904960. Its totient is φ = 10692864.

The previous prime is 20307319. The next prime is 20307347. The reversal of 20307345 is 54370302.

It is not a de Polignac number, because 20307345 - 2⁶ = 20307281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20307347) 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, 7384 + ... + 9753.

It is an arithmetic number, because the mean of its divisors is an integer number (2056560).

Almost surely, 2^20307345 is an apocalyptic number.

It is an amenable number.

20307345 is a deficient number, since it is larger than the sum of its proper divisors (12597615).

20307345 is a wasteful number, since it uses less digits than its factorization.

20307345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17224.

The product of its (nonzero) digits is 2520, while the sum is 24.

The square root of 20307345 is about 4506.3671621385. The cubic root of 20307345 is about 272.8251372522.

Adding to 20307345 its reverse (54370302), we get a palindrome (74677647).

The spelling of 20307345 in words is "twenty million, three hundred seven thousand, three hundred forty-five".