20239321 has 2 divisors, whose sum is σ = 20239322. Its totient is φ = 20239320.

The previous prime is 20239277. The next prime is 20239327. The reversal of 20239321 is 12393202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20070400 + 168921 = 4480^2 + 411^2 .

It is a cyclic number.

It is not a de Polignac number, because 20239321 - 2⁹ = 20238809 is a prime.

It is a super-2 number, since 2×20239321² = 819260229082082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20239292 and 20239301.

It is not a weakly prime, because it can be changed into another prime (20239327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10119660 + 10119661.

It is an arithmetic number, because the mean of its divisors is an integer number (10119661).

Almost surely, 2^20239321 is an apocalyptic number.

It is an amenable number.

20239321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20239321 is an equidigital number, since it uses as much as digits as its factorization.

20239321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20239321 is about 4498.8132879683. The cubic root of 20239321 is about 272.5201668435.

The spelling of 20239321 in words is "twenty million, two hundred thirty-nine thousand, three hundred twenty-one".