20697794 has 16 divisors (see below), whose sum is σ = 33545400. Its totient is φ = 9521280.

The previous prime is 20697779. The next prime is 20697797. The reversal of 20697794 is 49779602.

It can be written as a sum of positive squares in 4 ways, for example, as 17330569 + 3367225 = 4163^2 + 1835^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20697797) 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 in 7 ways as a sum of consecutive naturals, for example, 7934 + ... + 10214.

Almost surely, 2^20697794 is an apocalyptic number.

20697794 is a deficient number, since it is larger than the sum of its proper divisors (12847606).

20697794 is a wasteful number, since it uses less digits than its factorization.

20697794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2645.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 20697794 is about 4549.4828277509. The cubic root of 20697794 is about 274.5625839521.

The spelling of 20697794 in words is "twenty million, six hundred ninety-seven thousand, seven hundred ninety-four".