20764651 has 2 divisors, whose sum is σ = 20764652. Its totient is φ = 20764650.

The previous prime is 20764619. The next prime is 20764673. The reversal of 20764651 is 15646702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20764651 - 2⁵ = 20764619 is a prime.

It is not a weakly prime, because it can be changed into another prime (20764351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10382325 + 10382326.

It is an arithmetic number, because the mean of its divisors is an integer number (10382326).

Almost surely, 2^20764651 is an apocalyptic number.

20764651 is a deficient number, since it is larger than the sum of its proper divisors (1).

20764651 is an equidigital number, since it uses as much as digits as its factorization.

20764651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20764651 is about 4556.8246619768. The cubic root of 20764651 is about 274.8578924181.

The spelling of 20764651 in words is "twenty million, seven hundred sixty-four thousand, six hundred fifty-one".