20734321 has 2 divisors, whose sum is σ = 20734322. Its totient is φ = 20734320.

The previous prime is 20734309. The next prime is 20734361. The reversal of 20734321 is 12343702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10653696 + 10080625 = 3264^2 + 3175^2 .

It is a cyclic number.

It is not a de Polignac number, because 20734321 - 2¹⁵ = 20701553 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20734292 and 20734301.

It is not a weakly prime, because it can be changed into another prime (20734361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10367160 + 10367161.

It is an arithmetic number, because the mean of its divisors is an integer number (10367161).

Almost surely, 2^20734321 is an apocalyptic number.

It is an amenable number.

20734321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20734321 is an equidigital number, since it uses as much as digits as its factorization.

20734321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 20734321 is about 4553.4954705149. The cubic root of 20734321 is about 274.7240029848.

The spelling of 20734321 in words is "twenty million, seven hundred thirty-four thousand, three hundred twenty-one".