20297713 has 2 divisors, whose sum is σ = 20297714. Its totient is φ = 20297712.

The previous prime is 20297671. The next prime is 20297731. The reversal of 20297713 is 31779202.

Together with next prime (20297731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18258529 + 2039184 = 4273^2 + 1428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20297713 is a prime.

It is not a weakly prime, because it can be changed into another prime (20297213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10148856 + 10148857.

It is an arithmetic number, because the mean of its divisors is an integer number (10148857).

Almost surely, 2^20297713 is an apocalyptic number.

It is an amenable number.

20297713 is a deficient number, since it is larger than the sum of its proper divisors (1).

20297713 is an equidigital number, since it uses as much as digits as its factorization.

20297713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 20297713 is about 4505.2983253054. The cubic root of 20297713 is about 272.7819957631.

The spelling of 20297713 in words is "twenty million, two hundred ninety-seven thousand, seven hundred thirteen".