20359021 has 2 divisors, whose sum is σ = 20359022. Its totient is φ = 20359020.

The previous prime is 20359019. The next prime is 20359057. The reversal of 20359021 is 12095302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14356521 + 6002500 = 3789^2 + 2450^2 .

It is a cyclic number.

It is not a de Polignac number, because 20359021 - 2¹ = 20359019 is a prime.

Together with 20359019, 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 = 20358983 and 20359001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20359091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10179510 + 10179511.

It is an arithmetic number, because the mean of its divisors is an integer number (10179511).

Almost surely, 2^20359021 is an apocalyptic number.

It is an amenable number.

20359021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20359021 is an equidigital number, since it uses as much as digits as its factorization.

20359021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 20359021 is about 4512.0971842371. The cubic root of 20359021 is about 273.0563601564.

The spelling of 20359021 in words is "twenty million, three hundred fifty-nine thousand, twenty-one".