20492321 has 2 divisors, whose sum is σ = 20492322. Its totient is φ = 20492320.

The previous prime is 20492273. The next prime is 20492371. The reversal of 20492321 is 12329402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20205025 + 287296 = 4495^2 + 536^2 .

It is a cyclic number.

It is not a de Polignac number, because 20492321 - 2⁶ = 20492257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20492371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10246160 + 10246161.

It is an arithmetic number, because the mean of its divisors is an integer number (10246161).

Almost surely, 2^20492321 is an apocalyptic number.

It is an amenable number.

20492321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20492321 is an equidigital number, since it uses as much as digits as its factorization.

20492321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20492321 is about 4526.8444859527. The cubic root of 20492321 is about 273.6510066506.

The spelling of 20492321 in words is "twenty million, four hundred ninety-two thousand, three hundred twenty-one".