20324621 has 4 divisors (see below), whose sum is σ = 21025500. Its totient is φ = 19623744.

The previous prime is 20324609. The next prime is 20324641. The reversal of 20324621 is 12642302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3759721 + 16564900 = 1939^2 + 4070^2 .

It is a cyclic number.

It is not a de Polignac number, because 20324621 - 2¹⁴ = 20308237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20324593 and 20324602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20324641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350396 + ... + 350453.

It is an arithmetic number, because the mean of its divisors is an integer number (5256375).

Almost surely, 2^20324621 is an apocalyptic number.

It is an amenable number.

20324621 is a deficient number, since it is larger than the sum of its proper divisors (700879).

20324621 is an equidigital number, since it uses as much as digits as its factorization.

20324621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700878.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20324621 is about 4508.2835980005. The cubic root of 20324621 is about 272.9024818635.

Adding to 20324621 its reverse (12642302), we get a palindrome (32966923).

The spelling of 20324621 in words is "twenty million, three hundred twenty-four thousand, six hundred twenty-one".