20789801 has 2 divisors, whose sum is σ = 20789802. Its totient is φ = 20789800.

The previous prime is 20789789. The next prime is 20789843. The reversal of 20789801 is 10898702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11909401 + 8880400 = 3451^2 + 2980^2 .

It is a cyclic number.

It is not a de Polignac number, because 20789801 - 2⁶ = 20789737 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20789101) 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, 10394900 + 10394901.

It is an arithmetic number, because the mean of its divisors is an integer number (10394901).

Almost surely, 2^20789801 is an apocalyptic number.

It is an amenable number.

20789801 is a deficient number, since it is larger than the sum of its proper divisors (1).

20789801 is an equidigital number, since it uses as much as digits as its factorization.

20789801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 20789801 is about 4559.5834239544. The cubic root of 20789801 is about 274.9688162988.

The spelling of 20789801 in words is "twenty million, seven hundred eighty-nine thousand, eight hundred one".