20780093 has 2 divisors, whose sum is σ = 20780094. Its totient is φ = 20780092.

The previous prime is 20780059. The next prime is 20780113. The reversal of 20780093 is 39008702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20052484 + 727609 = 4478^2 + 853^2 .

It is a cyclic number.

It is not a de Polignac number, because 20780093 - 2¹⁴ = 20763709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20780003) 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, 10390046 + 10390047.

It is an arithmetic number, because the mean of its divisors is an integer number (10390047).

Almost surely, 2^20780093 is an apocalyptic number.

It is an amenable number.

20780093 is a deficient number, since it is larger than the sum of its proper divisors (1).

20780093 is an equidigital number, since it uses as much as digits as its factorization.

20780093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20780093 is about 4558.5187287100. The cubic root of 20780093 is about 274.9260098464.

Adding to 20780093 its reverse (39008702), we get a palindrome (59788795).

The spelling of 20780093 in words is "twenty million, seven hundred eighty thousand, ninety-three".