18920773 has 2 divisors, whose sum is σ = 18920774. Its totient is φ = 18920772.

The previous prime is 18920761. The next prime is 18920807. The reversal of 18920773 is 37702981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12124324 + 6796449 = 3482^2 + 2607^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18920773 is a prime.

It is a super-3 number, since 3×18920773³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18920873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9460386 + 9460387.

It is an arithmetic number, because the mean of its divisors is an integer number (9460387).

Almost surely, 2^18920773 is an apocalyptic number.

It is an amenable number.

18920773 is a deficient number, since it is larger than the sum of its proper divisors (1).

18920773 is an equidigital number, since it uses as much as digits as its factorization.

18920773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 18920773 is about 4349.8014897234. The cubic root of 18920773 is about 266.4687543668.

The spelling of 18920773 in words is "eighteen million, nine hundred twenty thousand, seven hundred seventy-three".