20735321 has 2 divisors, whose sum is σ = 20735322. Its totient is φ = 20735320.

The previous prime is 20735293. The next prime is 20735329. The reversal of 20735321 is 12353702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16491721 + 4243600 = 4061^2 + 2060^2 .

It is a cyclic number.

It is not a de Polignac number, because 20735321 - 2¹⁰ = 20734297 is a prime.

It is not a weakly prime, because it can be changed into another prime (20735329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10367660 + 10367661.

It is an arithmetic number, because the mean of its divisors is an integer number (10367661).

Almost surely, 2^20735321 is an apocalyptic number.

It is an amenable number.

20735321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20735321 is an equidigital number, since it uses as much as digits as its factorization.

20735321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 20735321 is about 4553.6052749442. The cubic root of 20735321 is about 274.7284194881.

The spelling of 20735321 in words is "twenty million, seven hundred thirty-five thousand, three hundred twenty-one".