20546321 has 2 divisors, whose sum is σ = 20546322. Its totient is φ = 20546320.

The previous prime is 20546311. The next prime is 20546327. The reversal of 20546321 is 12364502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13987600 + 6558721 = 3740^2 + 2561^2 .

It is a cyclic number.

It is not a de Polignac number, because 20546321 - 2⁶ = 20546257 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20546327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10273160 + 10273161.

It is an arithmetic number, because the mean of its divisors is an integer number (10273161).

Almost surely, 2^20546321 is an apocalyptic number.

It is an amenable number.

20546321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20546321 is an equidigital number, since it uses as much as digits as its factorization.

20546321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20546321 is about 4532.8049814657. The cubic root of 20546321 is about 273.8911647957.

The spelling of 20546321 in words is "twenty million, five hundred forty-six thousand, three hundred twenty-one".