20664727 has 2 divisors, whose sum is σ = 20664728. Its totient is φ = 20664726.

The previous prime is 20664689. The next prime is 20664737. The reversal of 20664727 is 72746602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20664727 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20664692 and 20664701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20664737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10332363 + 10332364.

It is an arithmetic number, because the mean of its divisors is an integer number (10332364).

Almost surely, 2^20664727 is an apocalyptic number.

20664727 is a deficient number, since it is larger than the sum of its proper divisors (1).

20664727 is an equidigital number, since it uses as much as digits as its factorization.

20664727 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 20664727 is about 4545.8472257655. The cubic root of 20664727 is about 274.4162913868.

The spelling of 20664727 in words is "twenty million, six hundred sixty-four thousand, seven hundred twenty-seven".