20300021 has 8 divisors (see below), whose sum is σ = 23237760. Its totient is φ = 17371728.

The previous prime is 20300017. The next prime is 20300039. The reversal of 20300021 is 12000302.

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 20300021 - 2² = 20300017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20299981 and 20300008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20300011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3095 + ... + 7083.

It is an arithmetic number, because the mean of its divisors is an integer number (2904720).

Almost surely, 2^20300021 is an apocalyptic number.

It is an amenable number.

20300021 is a deficient number, since it is larger than the sum of its proper divisors (2937739).

20300021 is an equidigital number, since it uses as much as digits as its factorization.

20300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4723.

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

The square root of 20300021 is about 4505.5544608849. The cubic root of 20300021 is about 272.7923344810.

Adding to 20300021 its reverse (12000302), we get a palindrome (32300323).

The spelling of 20300021 in words is "twenty million, three hundred thousand, twenty-one".