20788673 has 2 divisors, whose sum is σ = 20788674. Its totient is φ = 20788672.

The previous prime is 20788657. The next prime is 20788687. The reversal of 20788673 is 37688702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20584369 + 204304 = 4537^2 + 452^2 .

It is a cyclic number.

It is not a de Polignac number, because 20788673 - 2⁴ = 20788657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20788673.

It is not a weakly prime, because it can be changed into another prime (20788633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10394336 + 10394337.

It is an arithmetic number, because the mean of its divisors is an integer number (10394337).

Almost surely, 2^20788673 is an apocalyptic number.

It is an amenable number.

20788673 is a deficient number, since it is larger than the sum of its proper divisors (1).

20788673 is an equidigital number, since it uses as much as digits as its factorization.

20788673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 20788673 is about 4559.4597267659. The cubic root of 20788673 is about 274.9638431802.

The spelling of 20788673 in words is "twenty million, seven hundred eighty-eight thousand, six hundred seventy-three".