20738321 has 2 divisors, whose sum is σ = 20738322. Its totient is φ = 20738320.

The previous prime is 20738303. The next prime is 20738359. The reversal of 20738321 is 12383702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19140625 + 1597696 = 4375^2 + 1264^2 .

It is a cyclic number.

It is not a de Polignac number, because 20738321 - 2⁶ = 20738257 is a prime.

It is a Chen prime.

It is equal to p_1314476 and since 20738321 and 1314476 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20738371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10369160 + 10369161.

It is an arithmetic number, because the mean of its divisors is an integer number (10369161).

Almost surely, 2^20738321 is an apocalyptic number.

It is an amenable number.

20738321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20738321 is an equidigital number, since it uses as much as digits as its factorization.

20738321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20738321 is about 4553.9346723465. The cubic root of 20738321 is about 274.7416681458.

The spelling of 20738321 in words is "twenty million, seven hundred thirty-eight thousand, three hundred twenty-one".