20304021 has 8 divisors (see below), whose sum is σ = 27165600. Its totient is φ = 13489232.

The previous prime is 20304013. The next prime is 20304023. The reversal of 20304021 is 12040302.

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 20304021 - 2³ = 20304013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20303988 and 20304006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20304023) 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, 10671 + ... + 12428.

It is an arithmetic number, because the mean of its divisors is an integer number (3395700).

Almost surely, 2^20304021 is an apocalyptic number.

It is an amenable number.

20304021 is a deficient number, since it is larger than the sum of its proper divisors (6861579).

20304021 is a wasteful number, since it uses less digits than its factorization.

20304021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23395.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 20304021 is about 4505.9983355523. The cubic root of 20304021 is about 272.8102506805.

Adding to 20304021 its reverse (12040302), we get a palindrome (32344323).

The spelling of 20304021 in words is "twenty million, three hundred four thousand, twenty-one".