20998773 has 6 divisors (see below), whose sum is σ = 30331574. Its totient is φ = 13999176.

The previous prime is 20998771. The next prime is 20998777. The reversal of 20998773 is 37789902.

It can be written as a sum of positive squares in only one way, i.e., 19342404 + 1656369 = 4398^2 + 1287^2 .

It is not a de Polignac number, because 20998773 - 2¹ = 20998771 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20998771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1166590 + ... + 1166607.

Almost surely, 2^20998773 is an apocalyptic number.

It is an amenable number.

20998773 is a deficient number, since it is larger than the sum of its proper divisors (9332801).

20998773 is a wasteful number, since it uses less digits than its factorization.

20998773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333203 (or 2333200 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 20998773 is about 4582.4418163246. The cubic root of 20998773 is about 275.8870442002.

The spelling of 20998773 in words is "twenty million, nine hundred ninety-eight thousand, seven hundred seventy-three".