20388773 has 2 divisors, whose sum is σ = 20388774. Its totient is φ = 20388772.

The previous prime is 20388761. The next prime is 20388779. The reversal of 20388773 is 37788302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17623204 + 2765569 = 4198^2 + 1663^2 .

It is a cyclic number.

It is not a de Polignac number, because 20388773 - 2⁴ = 20388757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20388779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10194386 + 10194387.

It is an arithmetic number, because the mean of its divisors is an integer number (10194387).

Almost surely, 2^20388773 is an apocalyptic number.

It is an amenable number.

20388773 is a deficient number, since it is larger than the sum of its proper divisors (1).

20388773 is an equidigital number, since it uses as much as digits as its factorization.

20388773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 20388773 is about 4515.3928954190. The cubic root of 20388773 is about 273.1893072608.

The spelling of 20388773 in words is "twenty million, three hundred eighty-eight thousand, seven hundred seventy-three".