20664113 has 2 divisors, whose sum is σ = 20664114. Its totient is φ = 20664112.

The previous prime is 20664031. The next prime is 20664131. The reversal of 20664113 is 31146602.

It is a happy number.

Together with next prime (20664131) 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., 14348944 + 6315169 = 3788^2 + 2513^2 .

It is a cyclic number.

It is not a de Polignac number, because 20664113 - 2²⁰ = 19615537 is a prime.

It is not a weakly prime, because it can be changed into another prime (20664013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10332056 + 10332057.

It is an arithmetic number, because the mean of its divisors is an integer number (10332057).

Almost surely, 2^20664113 is an apocalyptic number.

It is an amenable number.

20664113 is a deficient number, since it is larger than the sum of its proper divisors (1).

20664113 is an equidigital number, since it uses as much as digits as its factorization.

20664113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20664113 is about 4545.7796910981. The cubic root of 20664113 is about 274.4135734983.

The spelling of 20664113 in words is "twenty million, six hundred sixty-four thousand, one hundred thirteen".