20304693 has 12 divisors (see below), whose sum is σ = 29397888. Its totient is φ = 13504680.

The previous prime is 20304689. The next prime is 20304701. The reversal of 20304693 is 39640302.

It is not a de Polignac number, because 20304693 - 2² = 20304689 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20302693) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1788 + ... + 6618.

It is an arithmetic number, because the mean of its divisors is an integer number (2449824).

Almost surely, 2^20304693 is an apocalyptic number.

It is an amenable number.

20304693 is a deficient number, since it is larger than the sum of its proper divisors (9093195).

20304693 is a wasteful number, since it uses less digits than its factorization.

20304693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5304 (or 5301 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 20304693 is about 4506.0729022065. The cubic root of 20304693 is about 272.8132603711.

Adding to 20304693 its reverse (39640302), we get a palindrome (59944995).

The spelling of 20304693 in words is "twenty million, three hundred four thousand, six hundred ninety-three".