20730313 has 2 divisors, whose sum is σ = 20730314. Its totient is φ = 20730312.

The previous prime is 20730277. The next prime is 20730373. The reversal of 20730313 is 31303702.

20730313 is nontrivially palindromic in base 8.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20502784 + 227529 = 4528^2 + 477^2 .

It is a cyclic number.

It is not a de Polignac number, because 20730313 - 2²¹ = 18633161 is a prime.

It is not a weakly prime, because it can be changed into another prime (20730373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365156 + 10365157.

It is an arithmetic number, because the mean of its divisors is an integer number (10365157).

Almost surely, 2^20730313 is an apocalyptic number.

It is an amenable number.

20730313 is a deficient number, since it is larger than the sum of its proper divisors (1).

20730313 is an equidigital number, since it uses as much as digits as its factorization.

20730313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 19.

The square root of 20730313 is about 4553.0553477857. The cubic root of 20730313 is about 274.7063002146.

The spelling of 20730313 in words is "twenty million, seven hundred thirty thousand, three hundred thirteen".