20764673 has 2 divisors, whose sum is σ = 20764674. Its totient is φ = 20764672.

The previous prime is 20764651. The next prime is 20764703. The reversal of 20764673 is 37646702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17833729 + 2930944 = 4223^2 + 1712^2 .

It is a cyclic number.

It is not a de Polignac number, because 20764673 - 2²⁰ = 19716097 is a prime.

It is not a weakly prime, because it can be changed into another prime (20767673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10382336 + 10382337.

It is an arithmetic number, because the mean of its divisors is an integer number (10382337).

Almost surely, 2^20764673 is an apocalyptic number.

It is an amenable number.

20764673 is a deficient number, since it is larger than the sum of its proper divisors (1).

20764673 is an equidigital number, since it uses as much as digits as its factorization.

20764673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 35.

The square root of 20764673 is about 4556.8270759378. The cubic root of 20764673 is about 274.8579894880.

The spelling of 20764673 in words is "twenty million, seven hundred sixty-four thousand, six hundred seventy-three".