20030021 has 8 divisors (see below), whose sum is σ = 22209888. Its totient is φ = 17910000.

The previous prime is 20030011. The next prime is 20030027. The reversal of 20030021 is 12003002.

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 20030021 - 2¹⁰ = 20028997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20029990 and 20030008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20030027) 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, 14255 + ... + 15596.

It is an arithmetic number, because the mean of its divisors is an integer number (2776236).

Almost surely, 2^20030021 is an apocalyptic number.

It is an amenable number.

20030021 is a deficient number, since it is larger than the sum of its proper divisors (2179867).

20030021 is a wasteful number, since it uses less digits than its factorization.

20030021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29923.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 20030021 is about 4475.4911462319. The cubic root of 20030021 is about 271.5775096461.

Adding to 20030021 its reverse (12003002), we get a palindrome (32033023).

The spelling of 20030021 in words is "twenty million, thirty thousand, twenty-one".