20324021 has 2 divisors, whose sum is σ = 20324022. Its totient is φ = 20324020.

The previous prime is 20324009. The next prime is 20324023. The reversal of 20324021 is 12042302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13060996 + 7263025 = 3614^2 + 2695^2 .

It is a cyclic number.

It is not a de Polignac number, because 20324021 - 2⁶ = 20323957 is a prime.

Together with 20324023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20323987 and 20324005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20324023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10162010 + 10162011.

It is an arithmetic number, because the mean of its divisors is an integer number (10162011).

Almost surely, 2^20324021 is an apocalyptic number.

It is an amenable number.

20324021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20324021 is an equidigital number, since it uses as much as digits as its factorization.

20324021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20324021 is about 4508.2170533372. The cubic root of 20324021 is about 272.8997963997.

Adding to 20324021 its reverse (12042302), we get a palindrome (32366323).

The spelling of 20324021 in words is "twenty million, three hundred twenty-four thousand, twenty-one".