20296021 has 2 divisors, whose sum is σ = 20296022. Its totient is φ = 20296020.

The previous prime is 20296019. The next prime is 20296039. The reversal of 20296021 is 12069202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10304100 + 9991921 = 3210^2 + 3161^2 .

It is a cyclic number.

It is not a de Polignac number, because 20296021 - 2¹ = 20296019 is a prime.

Together with 20296019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20295983 and 20296001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20296121) 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 as a sum of consecutive naturals, namely, 10148010 + 10148011.

It is an arithmetic number, because the mean of its divisors is an integer number (10148011).

Almost surely, 2^20296021 is an apocalyptic number.

It is an amenable number.

20296021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20296021 is an equidigital number, since it uses as much as digits as its factorization.

20296021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20296021 is about 4505.1105424839. The cubic root of 20296021 is about 272.7744159279.

The spelling of 20296021 in words is "twenty million, two hundred ninety-six thousand, twenty-one".