20164321 has 2 divisors, whose sum is σ = 20164322. Its totient is φ = 20164320.

The previous prime is 20164283. The next prime is 20164349. The reversal of 20164321 is 12346102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19580625 + 583696 = 4425^2 + 764^2 .

It is a cyclic number.

It is not a de Polignac number, because 20164321 - 2⁹ = 20163809 is a prime.

It is not a weakly prime, because it can be changed into another prime (20164381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10082160 + 10082161.

It is an arithmetic number, because the mean of its divisors is an integer number (10082161).

Almost surely, 2^20164321 is an apocalyptic number.

It is an amenable number.

20164321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20164321 is an equidigital number, since it uses as much as digits as its factorization.

20164321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20164321 is about 4490.4700199422. The cubic root of 20164321 is about 272.1831280123.

The spelling of 20164321 in words is "twenty million, one hundred sixty-four thousand, three hundred twenty-one".