20452021 has 2 divisors, whose sum is σ = 20452022. Its totient is φ = 20452020.

The previous prime is 20452007. The next prime is 20452027. The reversal of 20452021 is 12025402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17514225 + 2937796 = 4185^2 + 1714^2 .

It is a cyclic number.

It is not a de Polignac number, because 20452021 - 2¹¹ = 20449973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20451986 and 20452004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20452027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10226010 + 10226011.

It is an arithmetic number, because the mean of its divisors is an integer number (10226011).

Almost surely, 2^20452021 is an apocalyptic number.

It is an amenable number.

20452021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20452021 is an equidigital number, since it uses as much as digits as its factorization.

20452021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 20452021 is about 4522.3910711039. The cubic root of 20452021 is about 273.4715024556.

Adding to 20452021 its reverse (12025402), we get a palindrome (32477423).

It can be divided in two parts, 204 and 52021, that added together give a palindrome (52225).

The spelling of 20452021 in words is "twenty million, four hundred fifty-two thousand, twenty-one".